I recently bought a 12 bolt rear for my skylark. The guy that I bought it from could not remember what he pulled it from. It is the non c-clip style rear but has a very strange housing and cover there are no numbers on either axel tube. I bought a chrome diff cover fot it but none of the holes lined up with the hole in the housing. Ill try posting some pictures later. Does Anyone know what it is?????
How many bolt holes does the cover have and how many does the ring gear have and what is the measurement of the ring gear?
The both have 12 bolt holes. I brought the cover to my local speed shop that has been in buisness for over 20 yrs and he didnt even know what it was.
A picture would be a big help! There are only two 12 bolts for the A-body models....Olds and Chevy. Olds is a round, smooth cover. Chevy is an oval with an "eyebrow" in it.
could be the big bodied 71-76 buicks. Measure the ring gear. If 9 3/8, this is probably where it came from.
12 bolt Olds....not worth much and I would suggest selling it to an Olds purist. Better off with a corporate 8.5" rear from a 71-2 Skylark/Cutlass.
That's an Olds rear. But Olds A-body "12 bolts" have 10 ring gear bolts. If it's not a posi with a 3.08 or better gear, don't bother with it. Parts are available but expensive. Supercars Unlimited has parts and info on their website. Brian Trick in Erie, PA is an expert on thte Olds 12 bolt and can build it to live in a performance application if you really want to keep it. You can e-mail him at: thetrickfamily@yahoo.com. In the long run, it'll be cheaper to get the '71-up corporate 10 bolt, as George said.
