LEGO Technic 42099 4x4 X-Treme Off-Roader X-Treme Upgrade!

The new 42099 LEGO Technic X-Treme Off-Roader does lack torque as it can barely make it over a couple of books on the living room floor, so here’s my attempt at upgrading the model by switching two sets of gears over, as described by Racingbrick - credit to him - plus a few practical tips of my own.

You can see the original speed build here:

[drussell]

Nice upgrade 👍! Funny video - where did you get the tweezers? :-)

[aapelikahkonen]

Thank you! The instructions were very clear. This thing has some serious torque now. I also replaced the suspension springs with yellow ones, as the originals were way too soft for my taste. 😊

[samday]

Good on you for recognising other people’s work. Great clip and tips!
- tweezers!

[markw]

I'm building this model now with the mod Looking forward to seeing how it works

[betterthenspirit]

"40 DEGREASE???"
lego: "wait... thats illegal"

[FloorTileMaker]

First of all I’m not a dummy
Second of I ABSOLUTELY LOVE THIS VIDEO

[nickzwa]

Was considering buying this for an xmass gift but was concerned about lack of tuque in the reviews I watched, In one it couldn't drive across a bed :/ It seems maybe they made a mistake in the instructions and reversed those gears as it clearly works a lot better with this mod. thanks for the upload, seems like someone is getting an awesome gift soon :D

[boriscareaway]

Changing the gears right in the front motor assembly puts a lot of stress on whole transmission. Key is to keep your transmission spinning fast, not slow but forceful. So there is a reason in swapping the last pair, not the first

[joewake]

can you use the normal power functions motors in the model

[joewake]

have you got free download instructions for the x stream upgrade

[samday]

😅 I did it!!
For a moment there I thought it’d never go back together and I’d have to pull it apart and start at page 1. 😭😤😭😤

[thomasf.]

There are many examples of lego technic gear-boxes on youtube. Is it possible to integrate one of them into this model, such that you do not need to take it apart to change gears?

[avatarmanXL]

Hi can i do dhis when i building it???

[icecubeofficial]

But i don't understand, It Will upgrade also the speed or just the inclination?

[GDBAKED]

I've been trying to incorporate air ride on this model but can't seem to find any videos showing the process

[MarcMas]

what if you just changed one set of gears? (the rear one) will that change the performance? I mean, idk what happens, I think the front wheels will pull the rear ones but, I don't have the model, I'll get in around 2 months, I will swap both, but, that's just a curiosity

[tommasopannilini]

Hi there! I‘ve just finished the complete assembilng considering your upgrade.I think something is wrong. The speed is way too slow and can‘t believe this is the right one. When going, tires are all turning at the same speed. I, ve checked the upgrade and it‘s made right. Could you help me? I‘ve made photos kn all gears installed so may be it would help to find the mistake. Is there anyway we can write each other via mail so I can send you the pics. Many thanks, Tommaso

[hntrains]

What happens if you switch only one set of gears?

[piotrmuszel]

Power is the same ;) torque is better, but speed worse

[Alexander-Reitz]

You need no Handy, it works with Lego 88010 RC Control, see: Technicmaster0 or Pybricks YouTube Channel