'73 FJ40, 350, 3 speed. I had some oil leaks on my transfer in the usual places - emergency brake and the opening where my crossmember mounts to the back of the tc. When I took the crossmember off and pulled the cover, a spacer, a washer w/ some tabs, and a nut fell out. It was obvious that they went on the shaft that was sticking out but had come off. I tried to put them back, but the spacer would not go on enough to allow the washer and nut to thread up. The shaft has no play in it and the bearings inside appear ok. I don't know how long the spacer has been off, but it drives fine. What is the purpose of this spacer? Why won't it go back on?