center diff broke or rear diff?

[BrianG]

Originally Posted by lincpimp

Well, the revo center diff is no stronger than a front of rear diff...

True, the diffs are basically the same, however, the center diff sees 2.8462 times less strain than the F/R diffs.

I would check the rear first since that is the one that takes the most beating...

To help the diffs last longer, dial in some punch control to help limit the instant torque. You may also want to look into some aluminum diff cups and cases. They won't flex as much which makes the gears keep a consistent mesh. Granted, the Revo diffs are not the strongest design, but it'll help.