Herb

This is my hope. I’ll crack on and feedback. Thanks all. Oh. 100%. It’s my error somewhere not the instructions.

I didn’t think I explained it well! In the first build, I only had 3 out of 4 wheels working in normal 4-wheel drive mode. The diff worked like a dream, though. In the second (extremely careful) build, I have perfect 4-wheel drive. However, one wheel (the same one that didn’t move in build 1) does not work in diff mode. Thank you for your suggestion, though. I’ll give it a go.

Yes. As said, I'm 100% convinced that the rear suspension/differential is spot on after a complete rebuild. However, two separate builds have thrown up 2 different problems...ugh.

https://imgur.com/z17BlPm https://imgur.com/2vLPDOH https://imgur.com/KNVCn0I https://imgur.com/NrACF1s Any good for ya?

Yes. Definite. I’ll grab some pics.

Hi, I won a Mercedes Zetros Trial Truck in a completion and as such, it is my first Technic build. Everything was groovy until I powered up the engines for the first time. On the first attempt, I only had 3 wheels driving in 4 wheel drive mode whilst the differential worked fine. I then rebuilt the rear suspension unit (assuming a mistake was made) and now have perfect 4 wheel drive but the diff isn’t working as it should (one back wheel moves fine, but one totally unmoving) In both cases, it is the rear left wheel (looking from the back) which is the problem. I am as certain as I can be that the rear suspension unit is 100% correct so am looking for other solutions. Could it be the orange diff cog further to the front? All suggestions welcome. Thank you. H.