I just went from 4.56 on 35's to 37's. Mine is a 13 auto. So far I am happy with the change. My highway rpm is a bit lower for highway cruising which is nice at 75 to 80. As far as on the rocks I really didn't notice any big difference in crawling. I am checking gas milage averages right now. I did the Procal and am checking it against a GPS and some known distances to calibrate it. All in all I am happy with my 37's on 4.56 gears.
Mod, ORE Magnum 44 sleeves and welded C's, RCVshafts, 4.56 gears, Riddler diff covers, JEReel 1350 driveshafts, Evap relocation kit, AEV rear diff skid, JPI transfer case skid, ORE oil pan armor, Advanced Adapters shift cable, RK 3.5 lift with King 2.5 res shocks with adjusters, MB Black Razor 17-8.5 wheels with 37 MTRK's, poison Spyder brawler sliders, in powder coat, PSC front with a Warn Zeon Platinum and PSC BFH rear bumper.PSC Tire carrier. Oh yeah a Cobra75 to squak on.
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