Was it barking? If the diff screw was loosening up, then it would bark when you land or take off. And how was the gear itself? If it was loose, then the diff balls would have heated up and melted themselves into the gear.

Btw, the diff I'm talking about is for a XXX-T.. The XXX-4 may be able to go either way, I've never touched on of those. I do know the XXX-T diff MUST be installed with the screw on the left side.