I'm replacing all U joints, wheel bearings, and bushings in my 80 Vette, it has become quite a project! I noticed tonite that there is slight movement in the rear of the trany, that I thought before was the front U joint in need of being replaced... so how much play is normal in the rear of this trany, and if not, is there a bushing in the rear of the trany that can be replaced without pulling the hole transmission....or do I have more work to be done