I have stock 74 axles in my Jimmy (GM 12 bolt in rear and Dana 44 in front I think) and I want to gear up. I have 3.73 right now, and I'm thinking about a beefed up 700 R4 and 38" tires, so the gears have to go. I'd like to see something in the 5.xx range, but I don't know what fits in my cases. Anyone have any experience here? In every contest there must be a loser.