^^^^^
That's what I got my axle out of and it's 7.625 ring. The code on the Glove Box was GT4 G80, that is, 3.73, Posi.
I too have heard the 8.5 came in these but I don't believe it, never seen an 8.5 in a Blazer or Bravada, any year. I have heard you can find an 8.5 in a 4x4 manual trans, never seen one of these trucks at a yard though.
If I had known about it, I would have gotten a 8.8 out of an Explorer and after a certain year, 2000 I think, they all had Posi and Disk brakes. And best of all, they practically right drop into an S10.
http://v8s10.org/forum/viewtopic.php?t=5279