I have been having 35's and 5.13 gears for a long time now. I have an automatic transmission and four doors. This gear / tire combination is perfect in my opinion. I have pretty good power, can tow pretty good, take cross country trips on the interstate, cruise control works great, etc. etc. Basically, I cannot find one good reason not to run 5.13 gears with 315/70-17 tires with an automatic transmission. With my setup, I make 17 mpg. When I had the same tires and wheels but 4.10 gears, I got 12 mpg and everything sucked. When I was bone stock with my Sahara, I got 19. My performance, towing, acceleration, everything is better than stock and I only lost 2 mpg compared to running stock 18" wheels and 32" sahara street tires. My transmission even shifts better than stock. Read my numerous posts about this subject. My only regret about 5.13 gears is not doing it sooner. I ran for 4,000 miles with 35's and 4.10's and the longer I had that combination, the more annoyed I got with my Jeep. I was at the point to where I figured that I may have to go with a hemi or go back to stock tires/wheels. For $1,300, regearing solved my woes and I'm not really inclined to go for a hemi anymore. My Jeep feels like this is how it should have come from the factory, because there are no negative effects. If you have a manual transmission, most people prefer 4.88's with 35's. I have never driven a manual transmission JK, so I cannot vouch for that.
2014 JKU Copperhead Pearl
Too many mods to list. Too awesome to sell.