Need advice. 1987 FJ60 with semi-float rear end. Replacing all the rear end bearings (wheel and differential). Machine shop is doing the differential work for me (press bearings on/off and preload, etc). Machine shop tech says that the differential carrier (that the ring gear bolts to, which the FSM labels as the differential case) spins, and that I need a new one. Does this sound right and is it possible? After 248K miles anything could happen, but this is something I don't read about. I don't have any differential repair knowledge and need to know if this is the way they are made and/or if he could be right. I just don't know how many FJ60 parts he sees, but he is very experienced and I feel that I should trust him unless I have a good reason. (He also did my 2F head work and did a good job.) What you say?