which rear diff?

[uwasride]

I have a 2001 Tahoe LT Autoride, 3.73 ratio, and the g80 diff option. It also has the HD package (which I think is just the bigger rear brakes) I'm just looking to find out what size diff I have. Any help would be appreciated!!

 

[jdpber]

You have a 8.5" 10bolt 69" wide