I have an 02 Durango and it has the 3.55:1 9.25" rear. The 3.9:1 ratio is actually in an 8.25" rear NOT 9.25". Axles are the C clip type and the sure grip unit is a two pinion that looks like some of the later Dana types, you know, the kind that look like an open carrier. Also Durangos are 6 lug and I believe the pattern is 4.5" on 6. The axle bearings are cylindrical roller and are pretty good size.