Alternate models, custom designs and brick rebuilds for LEGO Technic sets.

Hello! I’m Davejsp, an independent LEGO® Technic designer. I create high-quality alternate builds for official Technic sets, as well as original MOCs of all kinds. All my digital building instructions are published here so you can build them too, many completely free!Don't forget to bookmark my website and subscribe my mailing list for "New MOCs" releases at the bottom of the website!Explore the models below by category and start building right away!

Davejsp's Lego Technic Alternate Builds / Designs

These MOCs can be built using only the parts from specific LEGO Technic sets, sorted by set number from newest to oldest:

Rebuild your Lego Technic "Bugatti Bolide" set 42151 into a "Stadium Super Truck" alternative model using these building instructions! No extra parts needed, just the 42151 set!

Functions:
- Functional front V6 fake engine connected to the rear wheels
- HoG steering
- Rear axle pendular suspension
- Openable doors and hoodPhotos:

Video:

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

Rebuild your Lego Technic "Transformation Vehicle" set 42140 into a remote-controlled "Battle Tank" alternative model using my building instructions! No extra parts needed, just the 42140 set!

Functions:
- Each track is remote-controlled independently just like the set's original model.

Worth mentioning aspects:
- The turret can be manually rotated 360º
- The main gun can be manually elevated.
- Has decent ground clearance for its size.
- Off-road capable.
- The hub's button is reachable through a hatch in the front.
- Batteries can be easily swapped from below the tank.
- Works with the original Control+ profile for the original model.Photos:

Video:

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Rebuild your Lego Technic “Transformation Vehicle” set 42140 into the “Johnny 5” robot from the 1986 “Short Circuit” movie! No additional parts needed, just the 42140 set!

Here’s a picture showing my Lego Technic replica side-by-side with the original model, both in the same pose for easier comparison.Functions:
-The tracks are remote-controlled. You can use the original Control+ profile for the 42140 set, but I also included instructions for a custom Powered Up app profile if you prefer.
-Shoulders, arms and forearms have a wide range of movement, the fingers also move. You can manually place them any way you want for different poses.
-The neck articulates back and forth, up and down.
-The head rotates 360º and can also tilt sideways.
-You can place the laser weapon vertically on the back.
-The support wheel in the rear rotates freely and always provides support for stability.
-No extra parts needed. If you have the 42140 set, then you have all you need to build it!Photos:

Video:

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Rebuild your "Transformation Vehicle" set 42140 into a "Racing Ripsaw" alternative model using my digital building instructions! No extra parts needed, just the 42140 set!

Functions:
- Remote-controlled drive and steering
- Independent front suspension

Worth mentioning aspects:
- Gearless 1:1 ratio for the least amount of friction possible.
- Drive is on the rear using the larger sprocket wheels for a bit higher speed.
- Excellent ground clearance for its size (4 studs), for solid off-roading performance.
- The batteries can be easily swapped from below, with no obstructions.
- The driver's cabin can be opened to easily access the hub's button.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.Photos:

Video:

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Rebuild your "Transformation Vehicle" set 42140 into a "Tracked Pickup" alternative model using my digital building instructions! No extra parts needed, just the 42140 set!

Tracked pickup trucks are found mostly in snowy environments.Functions:
- Remote-controlled drive and steering.
- Pendular suspension bogies in the front tracks

Worth mentioning aspects:
- Both rear tracks are driven using a solid axle, with a gear ratio of 1.67:1
- It's capable of light off-roading with decent ground clearance.
- The dump bed is fixed but can be used to transport cargo.
- It has a basic modeled interior.
- It has a tow ball at the rear which can be used to pull trailers.
- The button to turn on the hub is easily accessible through the cabin.
- Batteries can be easily swapped from below the vehicle.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.
- Easy to mod with regular wheels and tires if you so wish.Photos:

Video:

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Rebuild your Lego Technic "Transformation Vehicle" set 42140 into a remote-controlled "Rally Car" alternative model using these building instructions and go tear those dirt roads! No additional parts needed, just the 42140 set!

Functions:
- Remote-controlled drive and steering.

Worth mentioning aspects:
- It's rear-wheel drive with a gear ratio of 1:1.67 driving both rear wheels through a solid axle.
- Decent ground clearance (2 studs) given the MOC scale, it's suitable for light off-roading (watch the video).
- The button to turn on the hub is easily accessible through the cabin.
- Batteries can be easily swapped from below the car.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.Photos:

Video:

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Rebuild your Lego Technic "Transformation Vehicle" set 42140 into an off-road "Racing Buggy" alternative model using these building instructions!

Functions:
- Remote-controlled drive and steering.
- Rear axle suspension.

Worth mentioning aspects:
- It's rear-wheel drive with a gear ratio of 1:1.67 driving both rear wheels through a solid axle.
- Decent ground clearance (2 studs) given the MOC scale, it's suitable for light off-roading (watch the video).
- There is an axle on top of the buggy which can be pressed to turn on the PU hub.
- Batteries can be easily swapped from below the car.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.Photos:

Video:

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Rebuild your Lego Technic “Ford Raptor” set 42126 into a “Zarooq SandRacer” replica as an alternative model using these building instructions! No extra parts needed, just the 42126 set!

The Zarooq Sand Racer is a supercar dune buggy.

Here are some pictures comparing the MOC and the actual car, side to side:This was the only photo I could find showing its doors open. They look like butterfly doors, but I’m not sure. I tried to mimic them the best possible.This was also the only photo I could find showing its interior design.
I also tried to resemble it the most possible in the MOC.

I couldn't find specific information about many aspects of the car, so I had to get creative in a lot of areas.Worth mentioning features or details:
-Hand of God steering
-Independent front suspension
-Live axle rear suspension
-Functional fake engine connected to the rear wheels via a differential
-Openable doors
-Openable hood with a frunk in which you can store a suitcase
-Openable engine bay via a lever on each side of the car
-Aside from all the visible exterior details, it also has a modelled interior that tries to mimic the real vehicle.Demos:Photos:

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Rebuild your Lego Technic "Jeep Wrangler" set 42122 into an off-road "Hot Rod" alternative model using these building instructions! No additional pieces needed, just the 42122 set!

Functions:
- Hog front-wheel steering
- Rear axle suspension
- Functional V6 fake engine connected to rear wheels
- Openable doorsPhotos:

Video:

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Rebuild your Lego Technic "Jeep Wrangler" set 42122 into a “Compact Wheeled Excavator” alternative model using these building instructions! No additional parts needed, just the 42122 set!

Functions:
- Cabin door is openable.
- Hog front-wheel steering via steering wheel behind the cab.
- Upper structure 360º manual rotation via the exhaust pipe behind the cab.
- Front and rear blades control independently via levers on the sides.
- Fore boom, dipper boom and bucket can be manually and fully controlled using three levers at the rear of the counterweight.

Worth mentioning aspects:
- While creating this MOC, my focus was on its playability, everything else is secondary. The highlight is obviously the ability to have full control over the excavator’s booms and bucket using a simple lever system. It can perform very realistic and smooth movements, but it depends on your ability to control them. It may be easy to use, but difficult to master, very rewarding nonetheless.Photos:

Video:

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Rebuild your Lego Technic “Dom’s Dodge Charger” set 42111 into a “Hot Rod” alternative model using these building instructions! No extra parts needed!

Functions:
-Openable doors
-Hand of God steering
-Independent front suspension
-Live axle rear suspension
-Functional fake engine connected to the rear wheels via a differential

Worth mentioning details:
-Aside from all the visible exterior details, it also has a modelled interior with an adjustable driver’s seat, an adjustable steering wheel (with two red buttons for nitro), a very basic dashboard, a gear lever and two nitro bottles on the passenger side. The interior is also almost fully closed, with very few gaps remaining.Photos:

Video:

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Rebuild your Lego Technic "Top Gear Rally Car" set 42109 into a "Formula 1 Car" alternative model using these digital building instructions. No additional parts needed.

This is one of the best B-models yet, with well-crafted shapes, very compact, and much faster than the original model.Functions:
- RC rear-wheel drive powered by one PU xl-motor
- RC steering controlled by one PU l-motor

Worth mentioning aspects:
- Has a gear ratio of 1:3 from the motor to the rear wheels.
- Batteries can be easily swapped from below.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.
- The PU hub is completely concealed, but the MOC has a very quick and interesting way to turn it on, the method is explained in the building instructions.
- Staying true to F1 cars, it has very low ground clearance.
- The MOC has optional steps to add side mirrors or even change the color scheme of the exhaust (all within the set's inventory).Photos:

Video:

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Rebuild your Lego Technic "Top Gear Rally Car" set 42109 into a remote-controlled "Muscle Car" alternative model using these digital building instructions! No extra parts needed.

Functions:
- RC rear-wheel drive powered by one PU xl-motor
- RC steering controlled by one PU l-motor

Worth mentioning aspects:
- It has a gear ratio of 1:3 from the motor to the rear wheels.
- The button to turn the PU hub on or off is easy to reach.
- Batteries can be easily swapped from below.
- Features details not available on the original model, like a basic interior.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.Photos:

Video:

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Rebuild your Lego Technic "Top Gear Rally Car" set 42109 into a "Retro Hypercar" alternative model using these digital building instructions! No additional parts needed.

Functions:
- Remote-controlled drive and steering.

Worth mentioning aspects:
- It's super compact.
- It's RWD with a gear ratio of 1:3 through a solid axle.
- The batteries can be easily swapped from below, with no obstructions.
- The hub button is not reachable with a finger but can be pressed through a pin hole.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.
- The hood can be openedPhotos:

Video:

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Rebuild your Lego Technic "Top Gear Rally Car" set 42109 into an RC "Le Mans Prototype" alternative model using these digital building instructions! No extra parts needed.

Functions:
- Remote-controlled drive and steering.

Worth mentioning aspects:
- It's RWD with a gear ratio of 1:3
- The batteries can be easily swapped from below, with no obstructions.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.
- The hood can be openedPhotos:

Video:

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Breathe new life into your Lego Technic "Top Gear Rally Car" set 42109 by rebuilding it into a "Racing Cabriolet" with completely different aesthetics using these digital building instructions.

Functions:
- RC rear-wheel drive through a differential
- RC front-wheel steering

Worth mentioning aspects:
- The button to turn the PU hub on or off is reachable with a finger.
- Batteries can be easily swapped from below.
- Features details not available on the original model, like a basic interior.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.Photos:

Video:

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Rebuild your Lego Technic set 42103 "Dragster" into a "Racing Tuc-Tuc" alternative model using these FREE, digital building instructions.

This new design maintains the same pull-back functionality of the original model and even has a functional steering wheel, so it can turn to the sides!

Photos:

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Rebuild your Lego Technic set 42099 "4x4 X-treme Off-Roader" into this monster SUV named "Trail Blazer" alternative model using these digital building instructions!

Functions:
- Remote-controlled drive and steering
- Independent suspension on all wheels

Worth mentioning aspects:
- It's RWD with a gear ratio of 1.67:1
- Decent ground clearance for off-roading, 4 studs at the front axle, 3 studs at the rear axle.
- The planetary wheel hubs are not used on the rear wheels.
- The button to turn on the hub is accessible from below.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.Photos:

Video:

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Rebuild your Lego Technic "4x4 X-treme Off-Roader" set 42099 into this "Turbo Pickup" alternative model using these digital building instructions. No additional parts needed!

Functions:
- Remote-controlled drive and steering
- Independent suspension on all wheels

Worth mentioning aspects:
- It's RWD with a gear ratio of 1.4:1
- Decent ground clearance for off-roading, 4 studs at the front axle and 6 studs in the rear axle.
- The planetary wheel hubs are not used on the rear wheels.
- The button to turn on the hub is accessible from the driver's cabin.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.
- One highlight of this MOC is probably the transmission: it has the two PU xl-motors directly driving the rear differential, one on each side, which turned out to be quite efficient.Photos:

Video:

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Rebuild your Lego Technic "4x4 X-treme Off-Roader" set 42099 into this "Terrain Explorer" truck alternative model using these digital building instructions. No extra parts needed!

Functions:
- Remote-controlled steering and rear-wheel drive
- Live axle front and rear suspension
- Spare tire manual unload mechanism

Worth mentioning aspects:
- It's RWD with a gearless 1:1 ratio.
- Reasonable ground clearance for its size and type of vehicle (3 studs).
- The batteries can be easily swapped from below.
- The hub button can be pressed by pushing the driver's seat.
- The mechanism to unload the spare tire needs to be manually unlocked, it then slides down on its own.

Designer Notes:
Designing an optimized chassis saved a lot of pieces which I then used to create a more elaborated body, a simple interior, front grid, bull bar and even included a mechanism to slide and unload the spare tire, which is its only manual function.

To achieve the objective, several design choices had to be made:
- It has no transmission, and the rear wheels run directly on the motors: no gears involved means no friction and better performance.
- Live axle suspension was used both at the front and rear, this allowed me to use solid axles with a simpler design, reducing complexity all around and using way fewer pieces on the chassis.
- I chose not to use the planetary wheel hubs available on the set for two reasons, they would add complexity to the build, and most importantly, despite being lubricated on the inside, they still create a bit of drag if used for example on the front wheels, which have no traction and I really wanted to avoid all kinds of drag or friction.

Building Instructions:
- Instructions for cable management are included.
- To guarantee the correct operation of the MOC, I implemented limiters for the steering and suspension (both rear and front), these are pointed out on their respective steps and the option to take them out is also available.
- Real pictures are included whenever there is the need to see in detail.
- A detailed step-by-step tutorial is also included to set up the "Powered Up" app and control the MOC.Photos:

Video:

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Rebuild your Lego Technic "4x4 X-treme Off-Roader" set 42099 into this "Wild Beast" racing buggy with amazing RC performance!

Functions:
- Remote-controlled drive and steering
- Live, rear axle suspension

Worth mentioning aspects:
- It's rear-wheel drive with a gear ratio of 1:1.67 and the two xl-motors drive one wheel each.
- The front wheels have a positive caster angle for a steering with increased precision.
- I chose not to use the planetary wheel hubs available on the set for two reasons, they would add complexity to the build, and most importantly, despite being lubricated on the inside, they still create a bit of drag if used for example on the front wheels, which have no traction and I really wanted to avoid all kinds of drag or friction.
- Mostly, decent ground clearance (4 studs), except for two specific points (which are 2.5 studs above the ground).
- There is a button in the cabin to turn the PU hub on.
- Batteries can be easily swapped from below the car.

Designer notes: This MOC was created from the ground up to be fast and the chassis was designed with very specific build choices to accommodate speed.

I believe this is the fastest alternative model you'll find for this set.

Building Instructions:
- Instructions for cable management are included.
- Real pictures are included whenever there is the need to see in detail.
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.Photos:

Video:

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Rebuild your Lego Technic set 42099 "4x4 X-treme Off-Roader" into an extreme buggy called "Sand Runner" as an alternative model using these digital building instructions. No additional parts needed!

Functions:
- Remote-controlled drive and steering
- Independent suspension on all wheels

Worth mentioning aspects:
- It's RWD, the transmission has a differential and a final gear ratio of 2.34:1
- Decent ground clearance for off-roading, 4 studs at the front axle, 5 studs at the rear axle
- The planetary wheel hubs are not used on the rear wheels
- The button to turn on the hub is accessible through the driver's cabin
- Batteries can be easily swapped from below
- Needs a custom profile from the Powered Up app to be controlled. Detailed steps are provided within the MOC building instructions for this as well.Photos:

Video:

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Rebuild your Lego Technic set 42099 "4x4 X-treme Off-Roader" into a Jeep-like Off-Roader as an alternative model using my digital building instructions. No additional parts needed!

Functions:
- Remote-controlled 4x4 drive and steering
- Pendular suspension on the front axle
- Live axle suspension in the rear

Worth mentioning aspects:
- It's 4x4 with one XL motor driving the front wheels through a differential, and another XL motor driving the rear wheels through another differential.
- The final gear ratio is 1.4:1
- Decent ground clearance for off-roading, 4 studs at the front axle, 5 studs at the rear axle.
- The planetary wheel hubs are not used on this MOC.
- The Powered Up hub is freely accessible in the rear.
- Batteries can be easily swapped without disassembling anything.
- Uses the same Control+ profile as the set 42099 original model.Believe it or not, this specific Jeep-like Rat Rod was the inspiration for my MOC design.
The initial idea was to build a similar rat rod MOC, but I realized it would have very little ground clearance, which is not good for RC cars, so I changed direction halfway through the build to a proper Jeep-like off-roader.
Looking at my Jeep LEGO Technic MOC it's noticeable that it still loosely resembles the source model shapes. Photos:

Video:

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Rebuild your Lego Technic set 42095 "Stunt Racer" into a full-fledged, remote-controlled "Formula Off-Roader" alternative model using these digital building instructions!

Functions:
- RC rear-wheel drive powered by one PF l-motor
- RC auto-centering steering controlled by another PF l-motor

Worth mentioning aspects:
- It's lightweight
- It can do light off-roading but runs on tarmac as well
- The button to turn it on or off is easy to reach
- Batteries are easy to swap but need a quick, partial disassemblyPhotos:

Video:

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Rebuild your Lego Technic set 42095 "Stunt Racer" into a compact, remote-controlled "Battle Tank" alternative model using these digital building instructions!

Functions:
- Each track is remote-controlled independently like the set's original model.

Worth mentioning aspects:
- The turret can be manually rotated 360º
- The main gun can be manually elevated up to a certain point
- Has decent ground clearance for its size
- Off-road capable
- It's lightweight, compact and sturdy
- The button to turn it on or off is easy to reach on the side
- Batteries are easy to swap but need a quick, partial disassemblyPhotos:

Video:

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Rebuild your Lego Technic "Stunt Racer" set 42095 into a full-fledged, remote-controlled "Baja Racer" alternative model using these digital building instructions!

Functions:
- RC rear-wheel powered by one PF l-motor
- RC auto-centering steering controlled by another PF l-motor

Worth mentioning aspects:
- It's lightweight
- Decent ground clearance for off-roading
- The button to turn it on or off is easy to reach
- Batteries are easy to swap but need a quick, partial disassembly.Photos:

Video:

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Rebuild your Lego Technic "Stunt Racer" set 42095 into a full-fledged, remote-controlled "Racing Buggy" alternative model with these digital building instructions! No extra parts needed.

Functions:
- RC rear-wheel powered by one PF l-motor
- RC auto-centering steering controlled by another PF l-motor

Worth mentioning aspects:
- It's lightweight
- Can run on tarmac but is off-road capable as well
- The button to turn it on or off is easy to reach
- Batteries are easy to swap but need a quick, partial disassemblyPhotos:

Video:

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Rebuild your Lego Technic set 42095 "Stunt Racer" into a full-fledged, remote-controlled "Roadster" alternative model!

Functions:
- RC rear-wheel drive powered by one PF l-motor
- RC auto-centering steering controlled by another PF l-motor

Worth mentioning aspects:
- It's lightweight
- The button to turn it on or off is easy to reach
- Batteries are easy to swap but need a quick, partial disassembly.
- Adjustable windshieldPhotos:

Video:

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Rebuild your Lego Technic set 42095 "Stunt Racer" into a "Racing Inverted Trike" using these FREE, digital building instructions!

A reverse trike, also known as wheels forward trikes, or inverted trike has two front and one rear wheel. Reverse trikes are typically steered by the front wheels.Functions:
- Remote-controlled front-wheel drive and steering.

Worth mentioning aspects:
- The button to turn it on or off is easily accessible
- Batteries are easy to swap, a quick, very small disassemble is needed
- Adjustable rear spoilerPhotos:

Video:

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Rebuild your good old Lego Technic “Stunt Racer” set 42095 into a remote-controlled “UGV” alternative model!

An unmanned ground vehicle (UGV) is a vehicle that operates while in contact with the ground without an onboard human presence.Functions
- Remote-controlled, independently motorized tracks.

Worth mentioning aspects:
- It operates just like the original model
- The turret itself can rotate to the sides up to a certain point, not 360º
- The button to turn it on or off is easily accessible
- Batteries are obviously easy to swap.Photos:

Video:

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Rebuild your Lego Technic set 42091 "Police Pursuit" into a "Go-Kart" alternative model using these FREE, digital building instructions.This new design maintains the same pull-back functionality of the original model.

Photos:

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Rebuild your Lego Technic set 42084 “Hook Loader” into a “Bucket Loader” alternative model using these FREE, digital building instructions.

This new design features HOG rear-wheel steering, the bucket can be tilted using a lever, and the boom and bucket can be lifted using another lever.

Photos:

Video:

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Rebuild your Lego Technic set 42059 "Stunt Truck" into this "Formula Racer" alternative model using these FREE, digital building instructions.This new design maintains the same pull-back functionality of the original model.

Photos:

Video:

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Rebuild your good old Lego Technic “Mine Loader” set 42049 into a “Telehandler” alternative model!

Features:
-Openable cabin door
-Openable engine compartment
-Functional fake engine
-Hand of God steering
-Outriggers
-Boom lift
-Boom extension
-Attachment/forks tilt
-Forks adjustmentPhotos:

Video:

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Rebuild your Lego Technic set 42047 "Police Interceptor" into this "Sports Car" alternative model using these FREE, digital building instructions.This new design maintains the same pull-back functionality of the original model.

Photos:

Video:

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Rebuild your Lego Technic set 42046 “Getaway Racer” into a “Racing Truck” alternative model using these FREE, digital building instructions.This new design maintains the same pull-back functionality of the original model.

Photos:

Video:

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Rebuild your LEGO Technic Formula Offroader set 42037 into a racing "Quad Bike"!

Functions:
- Front-wheel steering
- Independent front suspension
- Rear axle suspension
- Functional fake engine connected to rear wheels through differentialPhotos:

Video:

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Rebuild your good old Lego Technic “Mine Loader” set 42049 into a remote-controlled replica of the “Rodine Runner” buggy with the help of some Power Functions elements!

The Rodine Runner was an off-road vehicle owned and raced in the USA by a man named Bob Rodine. Here are a few more comparison pictures. Functions:
- Remote-controlled rear-wheel drive
- Remote-controled steering

Worth-mentioning aspects:
- Batteries are easy to swap as the top can be opened up
- It's lightweight and off-road capable Photos:

Video:

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Rebuild your good old Lego Technic “Formula Off-Roader” set 42037 into a remote-controlled “Monster Pickup Truck” alternative model with the help of some Power Functions elements!

This MOC features remote-controlled rear-wheel drive and steering, along with rear axle suspension that improves handling.

The batteries can be swapped with only minimal disassembly, and the building instructions include clear, step-by-step guidance for clean cable management of all electric components. By default, the drivetrain uses a 1.4:1 gear ratio, which I find ideal for indoor driving. However, by using the spare gears included in set 42037, the ratio can easily be changed to 1.67:1, 1:1, or even 1:1.67, all with very minor structural adjustments.

The model is built at the same scale as LEGO® Technic figures, and one can even be seated in the driver’s position, an extra detail that makes the build more interesting.Photos:

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NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

Rebuild your Lego Technic set 8048 “Buggy” into a remote-controlled “Roadster” alternative model!

This MOC is a motorized alternative model for the 2010 LEGO® Technic Buggy (set 8048). It is built primarily using parts from the original set, with the addition of a few Power Functions components.

The model features remote-controlled rear-wheel drive through a solid axle with a 1:1.67 gear ratio, powered by a single PF L-motor, along with remote-controlled front-wheel steering driven by a PF servo motor. The front axle uses an independent double-wishbone suspension, providing smooth and responsive handling.

Thanks to its lightweight construction and low drivetrain friction, the buggy is very fast, maybe a bit too quick for indoor use. The power button is easy to access, and the IR receiver is mounted at the rear for improved signal reception.

A fast, responsive RC alternative that brings new life to set 8048.Photos:

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NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

Rebuild your Lego Technic set 8048 “Buggy” into a remote-controlled “Dune Buggy” alternative model!

This MOC is a motorized alternative model for the 2010 LEGO® Technic Buggy (set 8048). It is built exclusively using the parts from the original set, with the addition of a few Power Functions components, making it easy to recreate for anyone who owns the Buggy.

The model features remote-controlled rear-wheel drive through a solid axle with a 1:1 gear ratio, powered by a single PF L-motor, along with remote-controlled front-wheel steering driven by a PF servo motor. The front axle uses independent double-wishbone suspension, providing smooth and realistic handling.

Thanks to its lightweight design, the buggy feels responsive and fun to drive. The power button is easy to access, and the batteries can be swapped quickly, making it practical for extended play sessions.

A simple yet effective RC upgrade that brings new life to set 8048.Photos:

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NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

Davejsp's Lego Technic Original MOCs

These MOCs were designed from scratch using any combination of bricks. Most builds are motorized, a few are manual.

This MOC was created to test a two-Buggy motors setup.

As the name suggests, it’s an all-wheel-drive SUV featuring front and rear differentials, independent suspension on all four wheels, and remote control via Power Functions elements. The drivetrain is powered by two Buggy motors, both currently supplied by a single PF battery box, which turned out to be a limiting factor. While the model runs and is fully functional, this setup doesn’t allow the motors to reach their full potential. The original prototype used one IR receiver to power both motors, but they would hiccup under light load. I later revised the MOC to use two IR receivers, one per motor, which improved performance slightly; however, since both receivers still draw power from the same battery box, occasional power drops remain.

I don’t have a BuWizz or a second battery box at the moment, so I’m publishing the instructions for anyone who wants to try this model with a dual battery setup or a BuWizz and really put it to the test.

Enjoy the build, and feel free to share your results. I’d love to see how it performs with proper power delivery. Find me on my socials. Photos:

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NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

As the name suggests, this MOC is built around a subtractor mechanism. If you’re unfamiliar with the concept, a quick online search will give you plenty of explanations and variations, but essentially, a subtractor allows a tracked vehicle to turn smoothly and be controlled just like a standard RC car: one control for forward or backward motion and another for steering (see reference image below).

I built this MOC because, while many subtractor designs exist, there are surprisingly few complete models that actually make use of one. So this is my contribution to filling that gap.

The model is largely based on parts from set 42095, making it a strong starting point if you own that set. You’ll just need some extra liftarms, gears, and a handful of miscellaneous elements.

Note that only one L-motor drives the vehicle, while the second L-motor is dedicated entirely to steering, unlike traditional tracked models where both motors provide propulsion. Because of this, I geared the drivetrain down to a ratio of 1.667:1 to give the vehicle a bit more torque. Photos:

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NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

This MOC is a budget-friendly LEGO Technic replica of the vintage David Brown 885 tractor. It captures the essential functions of the original machine while keeping the build simple and accessible.

Functions:
-Front-wheel steering operated through the steering wheel
-Pendular front axle suspension for realistic movement
-Rear power take-off (PTO) driven by one of the rear wheels
-Manually liftable rear arms compatible with various add-on implements The David Brown 885 was built by David Brown from 1971 to 1980 in Meltham West Yorkshire. It had a 43 horsepower (32 kW) David Brown engine.Renders:

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

This is a remote-controlled 1:10 scale Roadster built with LEGO® Power Functions elements. It’s an original, fictional model featuring rear-wheel drive through a differential with a 1:1 gear ratio, powered by two PF XL motors, along with front-wheel steering controlled by a PF servo motor. All four wheels use independent suspension, and the car includes a functional fake engine that can be driven manually by rolling the car or powered independently by a dedicated PF M-motor.

Both doors are openable and semi-automatic, once unlocked, they open on their own and only need to be closed manually. Each door has its own locking mechanism to keep it securely shut during driving. A switch located underneath the car allows you to engage or disengage the fake engine from the main drivetrain for smoother RC performance when needed. The transmission is the simplest I could get it to be, in order to reduce friction.I also wanted to keep the steering as simple as possible, it's just a pinion and rack.The independent front suspension requires a more complex build because I really wanted to use those F1 wishbone arms.The independent rear suspension is also very simple to build.The connection between the fake engine and the transmission is one of the most interesting parts of the model. The engine can run independently using the dedicated M-motor, but because it’s linked to the drivetrain, it will also speed up or slow down automatically as the car moves. No matter whether the car is driving forward or in reverse, the engine always rotates in the same direction. The mechanism handles this by automatically shifting between two different gear paths depending on the car’s movement, ensuring that the fake engine runs consistently and smoothly.Photos:

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NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

This is a lightweight LEGO® Technic off-road racer built with Power Functions. It features rear-wheel drive via a solid axle with a default 1:1.67 gear ratio powered by a single L-motor, front-wheel steering controlled by a PF servo motor, and independent double-wishbone front suspension for smooth handling over rough terrain.

Despite its compact size, it offers reasonable ground clearance for off-roading, and the battery pack is easily swappable. The design style was inspired by the cars from the popular video game Rocket League, giving it a sporty and dynamic look.

A fun, functional, and fast RC build that combines realistic suspension at the front with playful, game-inspired styling. Photos:

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

This is a very small-scale LEGO® Technic dump truck MOC, measuring just 27 cm long, 10 cm wide, and 16 studs high, quite compact for a truck. Despite its size, it has reasonable ground clearance and is fully remote-controlled: a PF servo motor handles steering, while a PF L-motor powers two of the four rear wheels. The default gear ratio is 1.667:1, giving the truck moderate speed but substantial torque, which can be adjusted if desired.

The dump bed can be manually lifted using a side crank that operates a small linear actuator, simulating a hydraulic lift piston. The tailgate is secured with an axle that acts as a hook, it must be removed for the tailgate to open as the bed is lifted. The battery pack and IR receiver are housed inside the dump bed, with wires cleverly hidden in the chassis, and the building instructions explain how to conceal them. The battery pack can be turned on or off via a side button on the dump bed.

This build uses mostly Technic pieces, with only a few system elements.

A compact, functional, and educational MOC, perfect for RC enthusiasts and small-scale Technic builders. Enjoy building! Photos:

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NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

This is a small-scale LEGO® Technic off-road SUV built with Power Functions components. It features rear-wheel drive via a differential (default gear ratio 1.17:1, adjustable) powered by a single L-motor, front-wheel steering with auto-centering controlled by another L-motor, and independent front suspension using rubber belts.

A compact, educational, and fun build. Renders:

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This MOC is an evolution of my recent RC Budget Racer, which was originally designed to use as few pieces as possible and rely on very common parts so that builders with smaller collections could easily recreate it. While working on that model, I saw that it had the potential to become something more refined, so I created this upgraded variant: the RC Azure Racer.

In this version, the steering has been improved with a servomotor for more precise control, the rear-wheel gearing has been updated to a faster 1:3 ratio, and the overall aesthetics have been refined with a new color scheme and a few subtle visual adjustments. The result is a cleaner, faster, and more responsive RC racer.

I hope you have all the necessary parts to enjoy building this enhanced RC Azure Racer. Renders:

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

This is a simple and versatile LEGO® Technic remote-controlled racer built with Power Functions components. As the name suggests, it’s a generic RC racer designed to stay under 300 pieces and use common, easy-to-find parts, so most builders can recreate it without needing rare elements.

It features rear-wheel drive with a solid axle and a default 1:1.6 gear ratio (easily adjustable to other combinations), powered by a single L-motor. Steering is return-to-center, using another L-motor supported by a rubber-band mechanism for smooth self-centering.

Lightweight, nimble, and quick to assemble, perfect for fast, fun RC Technic builds. Renders:

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

This is a simple, lightweight LEGO® Technic remote-controlled racer built with Power Functions components. The goal was to keep the build close to 200 pieces and rely on common, widely available parts, making it easy for most builders to recreate.

It features rear-wheel drive with a solid axle and a default 1:1 gear ratio (easily adjustable to other ratios), powered by a single L-motor. Steering is return-to-center, driven by another L-motor and stabilized with a rubber-band mechanism.

A compact, nimble little racer that’s quick to build and fun to drive. Renders:

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

This compact, small-scale LEGO® Technic racer is built on top of my budget Power Functions RC chassis (see its page for details) .

Because it uses the same platform, it inherits all core functions: rear-wheel drive through a differential and precise front-wheel steering powered by a servo.

The default gear ratio is 1.4:1, but the drivetrain can be easily adjusted to other ratios with only minor tweaks to the chassis, making it a flexible base for tuning speed and performance. Renders:

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

As the name suggests, this MOC is a compact, small-scale LEGO® Technic muscle car built on top of my budget Power Functions RC chassis (see its page for details) .

Because it uses the same platform, it inherits the chassis functions: rear-wheel drive via an L-motor and front-wheel steering powered by a servo.
The small scale limits how much detail can be added, but this model still includes classic muscle-car elements such as a hood scoop, side exhaust pipes, and a fastback-style rear, along with a few other subtle design touches.

A simple and fun example of what you can build using the compact RC chassis. Renders:

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

This is a compact LEGO® Technic RC car chassis built with Power Functions and under 100 pieces, perfect for fast, small-scale vehicles.
It features rear-wheel drive with a differential powered by a single L-motor, plus precise front-wheel steering using a servo-driven rack system.

A simple, efficient, and budget-friendly platform for building your own remote-controlled Technic cars.

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

Controlling a LEGO® Technic RC car with the standard Power Functions IR remote isn’t very intuitive. The two vertical buttons work fine for drive, but using the second button for steering often feels awkward and imprecise.

This simple LEGO Technic steering wheel add-on transforms the PF remote into a far more natural and realistic controller. By attaching a compact steering wheel to the right button, you get smoother steering, better precision, and a much more enjoyable RC driving experience.

I use this exact setup for all my LEGO Technic remote-controlled cars, and it makes a huge difference in playability.

✔ Easy build
✔ Fits the official Power Functions IR remote
✔ Perfect upgrade for LEGO Technic RC cars
✔ Completely FREE building instructions

Download the free instructions and upgrade your controller today!

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

About Me

Hello! I’m Davejsp, an independent LEGO® Technic designer and lifelong Technic enthusiast.I design high-quality alternate builds for official Technic sets, as well as fully original MOCs ranging from compact, budget-friendly experiments to more advanced, feature-rich models. Every design starts from the same goal: creating something fun, functional, and satisfying to build, using clever mechanics and realistic solutions whenever possible.Over time, I’ve shared my LEGO Technic MOCs on several online platforms. While they can be useful, I often found that platform complexity, restrictive rules, features hidden behind paywalls, high service fees, or simple discoverability issues made the experience less enjoyable for both designers and builders. Great MOCs can easily get buried and difficult to find, and accessing instructions can become unnecessarily complicated.So I decided to take a different route.This website is my own space, built around a simple idea: focus entirely on the MOCs and make them easy to access. No clutter, no distractions, no forced registrations. If a model is free, you can view the instructions right away. If it’s a premium MOC, you can purchase and access the instructions in just a couple of clicks. That’s it.The site is designed to be fast, clear, and intuitive, whether you’re casually browsing for inspiration or looking for an alternate build for a specific Technic set. Everything is organized by category, navigation is kept minimal, and the emphasis is always on the models themselves.This is a website made by a LEGO Technic fan, for LEGO Technic fans: a place where creativity comes first, builds are easy to explore, and the experience stays enjoyable from start to finish.Some of my LEGO Technic MOCs are released as premium building instructions. This helps cover the cost of new sets, parts, and development time, and allows me to keep creating more models, including many free ones. If you enjoy my work, purchasing a premium MOC or leaving a tip directly supports future designs.
Whether you build a free model, grab a premium one, or just browse for inspiration, I’m glad you’re here.If you’d like to chat, share feedback, or show me something you’ve built, feel free to reach out. You can find me on my social platforms linked in the site footer, or get in touch through the contact section. I’m always happy to connect with fellow LEGO Technic enthusiasts and talk builds, ideas, or mechanics.Thanks for stopping by, and happy building!

Contact

Want to get in touch? I’m always happy to hear from fellow LEGO® Technic fans.If you’d like to share a build, ask a question, give feedback, or just chat about Technic MOCs, you can reach me on my social platforms like Instagram, Facebook, or Reddit. You’ll also find links to all of them in the site footer.If you prefer a more direct or private way to reach out, you can also use the button below to email me directly.Whether it’s a quick message or a longer conversation, feel free to say hi, I’ll get back to you as soon as I can.

• Message Davejsp

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Copyright & Licensing

© Davejsp - All Rights ReservedAll LEGO® Technic MOCs, alternative builds, original designs, images, renders, and building instructions displayed on this website are original creative works by Davejsp, unless explicitly stated otherwise.These creations are protected by copyright law. You may not reproduce, redistribute, resell, or publicly share any part of these designs, images, or instructions without prior written permission from the author.Some models are offered for free, while others are paid. Free availability does not grant redistribution rights.LEGO® is a trademark of the LEGO Group, which does not sponsor, authorize, or endorse this website or its content.For licensing requests, collaborations, or permissions, please use the Contact section of this website.

Unauthorized reposting of these MOCs or images on marketplaces, social media, or instruction-sharing platforms is prohibited.

Terms of Service

Effective date: [01-01-2026]Welcome to davejsptechnicmocs.comBy accessing or using this website, you agree to the following terms.1. Intellectual Property
All content on this website, including but not limited to LEGO Technic MOCs, building instructions, images, renders, text, and downloadable files is the exclusive intellectual property of Davejsp, unless stated otherwise.
LEGO® is a trademark of the LEGO Group. This website is not affiliated with, sponsored by, or endorsed by the LEGO Group.2. Use of Instructions
When you obtain building instructions (free or paid), you are granted a personal, non-transferable license to use them for personal, non-commercial purposes only.You may not:
-Redistribute or share the instructions
-Resell or repackage the instructions
-Upload the instructions to other websites or platforms
-Use the designs for commercial purposes without written permission3. Physical Builds
Building physical models using the instructions is permitted for personal use only. Selling physical builds based on these designs is not allowed without explicit written consent.4. Accuracy & Updates
Instructions are provided as-is. While care is taken to ensure accuracy, minor errors or updates may occur. Instructions may be updated over time to improve clarity or functionality.5. Limitation of Liability
Davejsp is not responsible for damages, part breakage, or injuries resulting from the use or misuse of instructions or models.

Privacy Policy | Refund Policy

Privacy Policy

Effective date: [01-01-2026]Your privacy is respected.What information is collected:
-Information you voluntarily provide via contact forms or email
-Basic, non-identifiable technical data (such as browser type or page visits) for analytics purposesHow information is used:
-To respond to inquiries
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-To improve the website experienceWhat is not done:
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Terms of Service | Refund Policy

Refund Policy

Effective date: [01-01-2026]Due to the digital nature of the products offered on this website, all sales are final.No refunds:
-Digital instructions are delivered instantly or made immediately accessible
-Once accessed or downloaded, they cannot be returnedExceptions - If you experience:
-A technical issue preventing access
-A missing or corrupted file
Please contact me, and I will ensure you receive the correct files or access.Refunds will not be issued for:
-Change of mind
-Lack of building experience
-Misunderstanding of product description
-Incompatibility with parts not listed as required

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