Originally Posted by fastbynature
what does a thrust bearing actually do in a diff. Do you need it? I've always wondered. Can you get away with using the washers without the balls?
The head of the diff screw would want to spin with the left
outdrive, the thrust bearing prevents that from happening. And since the nut does spin with the right
outdrive if no thrust bearing were in place the diff would either loosen or over tighten as stated above.
If you allow the thrust bearing to deteriorate far enough this will happen as the bearing begins to seize.