Thanks! That is a starting point at least..... I did find out that it has the Dana clutch type (22685x) sure grip unit in it.
I had three rear ends put together (3.55, 3.91, and 4.30), and ended up with 3.91 as the best "over-all" ratio for what I do. The other two are Auburn cone sure-grips, this one is a clutch.
