magoo_oner said:
The Chevy 12 bolt rear is a "c" type rear and the Olds 12 Bolt is a "O" type rear....the O type rear cover is smooth while the C type rear is ribbed. Also the O type rear has smaller parts inside and isn't as strong. Here's a link to further advise ya..almost at the end of the page is a diagram of both rear end covers nest to each other. : http://www.supercarsunlimited.com/info/ ... iff_id.htm
