I am still looking into it, but from what I know, the Olds 10 bolt rear is different from the rest of the B-O-P clan. If you have a differential case carrier gear housing thingy that looks like this:
With the following numbers : 671, 672, 673 or 588 (673 shown) I can almost guarantee that it won't fit a Pontiac rear end. this is the Olds A-Body 10 bolt posi differential case, and it is different from Buick and Pontiac.
What I was also referring to in my previous post was the 12-bolt looking rear end that is actually a 10-bolt. As most of us know, you can tell a GM 12-bolt just by counting the number of bolts that hold the cover on to the housing. NOT true in the world of Dr. Oldsmobile. In the late 60's and early 70's, they stuck a whole bunch of 8.5" 10-bolt rear ends (that are different, incidentally, from the second gen 8.5" 10-bolt) under Cutlass, 442 and F-85 cars with 12 bolt covers. These are NOT the 12 bolt A-body rear ends that are rather prized in the A-Body world, whose inner workings are the same as the 12 bolt Camaro rear end.
