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.
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