Thanks for your reply. If I had it to do over I would get a 9.25" rear end with 3.55' for the D and have a new ring and pinion and master bearing kit put in by my 4X4 shop.But, I am now at 3.92 with my 8.25 and I'm going to stick with that until I get a bigger truck or bite the bullet for a class C motorhome.