Got a TT-01R and I just picked up a Tamiya TT-01 ball diff (to be installed in the rear). But when I put it into the car, the dog bones are binding up with the diff cups and not allowing the suspension to move up and down freely. I've already removed all o-rings in the cups and it is still binding.

How to solve this binding issue? I heard shorter dogbones? How about universals? Any aftermarket universals will solve this?