Originally Posted by
looper
sounds like improper diff shimming might want to check into that.
Are you using the upgraded aluminum "inserts?" The ring and pinion DOES need to "wear in." The Losi is very tight from the factory.
Also, check to make sure the CVD hasn't loosened up on the pinion shaft. If it has, be sure to get it put back with no slop.
Did you grease the teeth of the ring gear? You should every time you take the diff out... just a thin line around the gear tooth surface.
And the comment about worn teeth on the rear ring and pinion could be right. I replaced my rear ring and pinion 3 times on my Losi buggy... then I replaced the buggy. If the ring and pinion in the rear have gone bad, replace them, AND the bulkhead.