Its a pretty bullet proof gearbox to be honest .. the stock diff parts are the only ones you can get and work perfectly as long as all the little gears are built in the right place ... Have a good look and make sure everything is meshing OK, make sure the diffs are in the correct way round, in some cars its possible to put them in back to front !! I don't really know what you mean by a 12t motor, the kit Schumacher motor is 5000ish KV motor and works really, I'd fit the largest of the supplied pinions and that might help if you are having pinion/spur meshing issues. The kit spur isn't brilliant but works well enough, one from RW racing will mesh a little quieter tho ...
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