I have a 2012 JKU auto running 35s, a procal and CAI. I'm looking at getting new tires so I thought u may as well jump up to 37's. I'm going to beef up the front Dana 30 and regear. I currently have the stock 3.21 which I am actually happy with performance wise. I'm thinking of jumping to 4.88 and have been looking around online for a set. Rock auto sells the fronts for $120 and rear for $140 and $65 each for the install kits. Anyone use these sets before? Seems really reasonable.