Losi XXT tranny problems.

Go to a local rc track or hobby shop. Someone should be able to help you. Probably need new balls for the diff, those rings that set up against the balls and the drive cups, and probably a new thrust bearing. Unscrew that center screw, make sure you take note of how things are attached and in what side/order, that will pull your two output drive cups apart from your differential gear, you'll see all the ball bearings and the two rings they ride against. Make sure you find a how to or use the manual if you got one when doin it, so you know which lube goes where. I kinda got a crash xxx-t tranny 101 course the other day when I was messin with mine, doin it wrong, tearin it apart, puttin it back several times over. The exploded parts view is very helpful.