I've rebuilt several 10 bolt rear ends. When I pulled the axles to install new backing plates, I'm used to a round pin with the 8mm bolt to hold everything togethor. When I took the cover over, I found the standard 8mm bolt, but this square block fell out. I've never encountered this before.



Here's why I'm asking, after I put the axles back in, I install the C Clips just like the rest. I installed the block, and the 8mm bolt. The problem is the axles turn freely, but the pinion doesn't turn, I can spin the pinion, then the axles won't turn. Has anyone ever encountered this before?