Total newb here............. Got the parts, put it back together ran great except when I punched it was making a sound like the gear mesh was wrong but the spur gear was never hitting it was close enough to strip the paint off the chassis but that was not what was making the noise. The front diff gear or ring gear some of the teeth are cracked not totally gone but enough when I punch it the diff moves slightly and the pinion slips on those teeth. Guess this happend when I hit the tree
. And the Spur is 49t and the pinion is 12t says so in the manual.