How can I tell what rear I got?

[drop the hammer]

well now I gotta check to see what I got. Thank you 85_SS it probably didnt have posi in the first place, gonna check tomorrow.

 

[v8power]

dentification of a 7.5" vs. a 8.5" rear axle can be a little difficult if you don't know what to look for.

The 7.5" rear axle can be identified by the "fangs" on the bottom of the center section:



While the 8.5" rear axle can be identified by the "triangles" on the bottom of the center section:



...from oldsgmail.com

that is good info. thanks. i will have to keep my eye open for that at the junk yard.