4x4 RC Off Road Truck - LEGO Technic 42099 B Model




My first alternate model of 42099. The Off Road Truck features independent suspension, 4 wheel drive, steering with Ackermann geometry, tilting cab and fifth wheel. It has 2 gearing options. In high gear it climbs around 40°, in the low gear it can crawl up to 53° slopes, sideways it holds up to 44°.
Follow me here:
Login to hide ads!


Name 4x4 RC Off Road Truck - LEGO Technic 42099 B Model
Designer grohl
Designed 2019
Inventory 958 parts
Theme Technic > Model > Off-Road
Alternate Build of 42099-1 4x4 X-treme Off-Roader


  • 2 months, 1 week ago Urbal Level 5
    Milan, many thanks for your efforts! I think proper drivetrain is great, however, the lack of central diff winds up the transmission and slows the vehicle  - so my question is whether you introduced Ackermann geometry to compensate negative effect?
    • 1 month, 3 weeks ago A_morti Level 6
      I also built it, and found this was a problem. Not much you can do with just the pieces from 42099, although if you had a spare differential and a little patience I'm sure you could make a space to fit it.
      • 1 month, 2 weeks ago Urbal Level 5
        I was thinking about central diff as well... But actually came across much more simple solution: I believe most of the real-life off-road trucks have part-time 4WD, so in this case I would just remove the connection from front axle to make it rear-wheel drive! And when I need I can easily engage front axle back - mimicking real life behaviour of such vehicles. Shame there are parts in the set to make a proper switcher. Have just tried planet wheel hubs in idle mode - and they seem to spin fairly easy, so should not be a problem in 2WD setup. Central diff would be a more elegant solution, but I think part-time is more appropriate here for long turns - with Ackermann geometry this should be a fun!
  • 3 months ago Ruben13 Level 5
    its too heavy on the front, nice MOC! Can you also design one for the 42100?
  • 6 months, 4 weeks ago Thewood Level 10
    This is awesome to see a c model this early after realese great job!
    • 6 months, 4 weeks ago grohl Level 12 Designed this MOC
      Thank you. It would have been earlier if I did not take the vacation right after finishing the model.
  • 6 months, 4 weeks ago syphoon Level 14
    Perfect B-model!!! Finally, a reason to consider buying this set.
    • 6 months, 4 weeks ago grohl Level 12 Designed this MOC
      Thank you very much.
to your account to add or reply to comments.
Already have some of the parts? Use the Build this MOC page to only show the parts you are missing.
Create an account to change the default filters used.

Waiting for Inventory to load