Beyond the Track: Innovative Alternative Builds for LEGO Technic Set 42104 Race Truck

From its sleek aerodynamic styling to its robust pull-back motor, the LEGO Technic 42104 Race Truck is more than just an adrenaline-pumping model—it’s a treasure trove of parts and possibilities. Beneath that striking blue-and-yellow exterior lies an ingenious assortment of beams, gears, panels, and connectors, all waiting to be reimagined. Whether you’re a seasoned Technic builder or a newcomer eager to stretch your creativity, the 42104 set offers an exceptional playground for experimentation.

Imagine converting your Race Truck into a high-downforce LMP1 prototype, then into a roaring dragster, and on to a vintage ’70s Formula 1 machine—all without buying a single extra part. That’s the beauty of alternate builds (MOCs): they maximize the utility of one set while challenging you to think like an engineer and an artist in equal measure. Each designer featured here has poured ingenuity into reinterpreting common Technic elements—turntables become turret barrels, pull-back motors drive unexpected wheelbases, and liftarms morph into sleek car bodies or sturdy farm machinery.

These 22 builds demonstrate the remarkable breadth of possibilities. You’ll find on-track racers, rugged off-roaders, elegant racers from past eras, and even functional work vehicles like forklifts and tractors. Each model not only repurposes the Race Truck’s parts but also introduces novel building techniques that you can incorporate into your own creations. By studying these designs, you’ll pick up tips on weight distribution, gearing ratios, panel integration, and more—skills that transcend any single model.

So buckle up and prepare to explore a curated gallery of MOCs crafted by builders from around the world. At the end of this article, you’ll find direct links to instructions so you can embark on your next build immediately. Let’s dive into the endless potential of LEGO Technic 42104!

Alternative Builds Gallery

1. LMP1 Car
   
   Designer: grohl
   Get the instructions: LMP1 Car on Rebrickable

2. Track Race Car
   
   Designer: grohl
   Get the instructions: Track Race Car on Rebrickable

3. Pull Power Package
   
   Designer: Keep On Bricking
   Get the instructions: Pull Power Package on Rebrickable

4. Rat Rod
   
   Designer: grohl
   Get the instructions: Rat Rod on Rebrickable

5. Formula 1 Alt Build
   
   Designer: BricksByCas24
   Get the instructions: Formula 1 Alt Build on Rebrickable

6. Race Rod
   
   Designer: 13neat8
   Get the instructions: Race Rod on Rebrickable

7. Cabover Racer
   
   Designer: BricksByCas24
   Get the instructions: Cabover Racer on Rebrickable

8. Muscle Gasser
   
   Designer: Keep On Bricking
   Get the instructions: Muscle Gasser on Rebrickable

9. Dump Truck
   
   Designer: Keep On Bricking
   Get the instructions: Dump Truck on Rebrickable

10. Heli C
    
    Designer: Keep On Bricking
    Get the instructions: Heli C on Rebrickable

11. Speed Slider
    
    Designer: Keep On Bricking
    Get the instructions: Speed Slider on Rebrickable

12. Forklift
    
    Designer: Keep On Bricking
    Get the instructions: Forklift on Rebrickable

13. Rat Rod No. 2
    
    Designer: 13neat8
    Get the instructions: Rat Rod No. 2 on Rebrickable

14. Chopper Trike
    
    Designer: Keep On Bricking
    Get the instructions: Chopper Trike on Rebrickable

15. Plow Back Tractor
    
    Designer: Keep On Bricking
    Get the instructions: Plow Back Tractor on Rebrickable

16. Dragster
    
    Designer: Keep On Bricking
    Get the instructions: Dragster on Rebrickable

17. Power Buggy
    
    Designer: Keep On Bricking
    Get the instructions: Power Buggy on Rebrickable

18. Rally Car
    
    Designer: Keep On Bricking
    Get the instructions: Rally Car on Rebrickable

19. Very Hot Rod
    
    Designer: Barcia
    Get the instructions: Very Hot Rod on Rebrickable

20. 1970s F1 Race Car
    
    Designer: VintageTechnic
    Get the instructions: 1970s F1 Race Car on Rebrickable

21. Bush Plane
    
    Designer: Inter86
    Get the instructions: Bush Plane on Rebrickable

22. 42104 Race Rod
    
    Designer: 13neat8
    Get the instructions: 42104 Race Rod on Rebrickable

Dive into any of these projects to refresh your 42104 collection with fresh challenges and new techniques—you’re only limited by your imagination!

Click here for more alternative builds and Modifications for this Lego set