tc4 ball diff help needed

[simplechamp]

Well depending on the spur/pinion he's using he could have that thing geared for 50mph! Maybe try a 2s or 3s? Might just be too much power with 4s and it's causing the ball diff to slip (especially if the ball diff is already worn and needs rebuilding)

EDIT: I also wanted to add that his motor is running about 50,000 rpm on 4s with wide-open-throttle, which is pushing the max rpm for the Velineon 3500.