2005 Chevy trailblazer Diff!

I have this trailblazer 6 Cylinder 4x4 regular not ext. Guys does anyone what kind of diff do I have on this one a 8.0-8.5ring gear diameter?

This is a new type diff it is not the old style 10 bolt. I believe the ring gear is 8.5, but is a stronger unit.