Originally Posted by cepx111
Now I dont know about BOP rearends but I have always thought that when a rearend was refered to as a 10 bolt or 12 bolt, it was in reference to the cover bolt count, not the ring gear bolts.
Tod is exactly right, always measure the ring gear itself and then you'll know for sure what you have.
Heres a link to a olds only site on their rearends.
http://www.oldsmobility.com/10bolt-tech.htm
Goodluck, Charles
No...it refers to the ring gear bolts...but they normally coincide with each other...That is what I thought back when I bought that one(cover bolts)...but that goof ball olds rearend I had had 12 bolts in the cover, 10 in the ring gear and the axles from a 10 bolt fit it, but the ones from a 12 didn't....best I remember that was 20 years ago...was given the bad news by the guy I hired to build the rearend for me.