After plenty of crud scraping off, I got the code off of my 71 Cutlass rearend.

Here's what I got: SAB 0851

What all do I need to be aware off before ordering gear and an Eaton posi?

Thanks a bunch.

 

Just need to tell them it's a 71 Olds 10-bolt with 8.500" ring gear, 28 spline. Gears here http://www.moserengineering.com/gear...s-10-bolt.html
eaton posi unit here
http://www.moserengineering.com/diff...28-spline.html

507OLDS is da man when it comes to any and all questions about these things. Check this thread...

https://classicoldsmobile.com/forums...ine-axles.html

 

You can also pm Monzaz on this forum, he is another Olds information source and a rebuilder of these units.