Gdool Rc Trucks Car Spare Parts Differential Assembly Spare Parts 2Pc Aluminum 25-Zj06 Lg-Zj06 & 1 Pcs Main Drive Shaft 25-Zj05 Lg-Zj05B For High Speed 1:10 9125 S920 S921 Rc Trucks-14 Yrs & Up,Silver

This drive train kit again was spot on! An exact fit. The drive shaft length was exactly the same length as the original, and yes, the pinion gears had ten teeth as opposed to the twelve teeth on the originals. That just changed the gear ratio ever so slightly. I would highly recommend this drive train kit for the Hosim 9125 rc truck.

There's nothing wrong with the quality of these upgraded parts - the problem is with the actual RC truck they are for. Ever see a POS 'real' car with an aftermarket spoiler, and think, "why"? That's kinda what these upgraded parts are like - the original ones are sufficient for this toy-grade rc vehicle, and serve no useful purpose - unless you plan to rebuild the entire thing. If that is your intention, you should have bought a better rc vehicle in the first place.

I just installed this so it's to be determined if it's any good the only things I've seen so far is that the pinion gear has 10 teeth and original has 12 but with this you should also be changing the spur gear and diffs that come with it and the other thing is the drive shaft was to short for my truck so I reused the original

Perfect product

stripped in 5-6 battery cycles. buy elsewhere.