Originally Posted by WarPig512

I'd consult a reputable shop on this. Personally I went 4.88 with 35's and extremely pleased. I'm also not 100% on this but unless you're running more than a Dana 30 (and I believe you are at 3.21) you can't go more than 4.10. I believe the carrier won't support it. In my opinion 4.56 is only going to leave you wanting more unless you drive in relatively flat area. Any introduction to grade running a 4.56/37" is going to result in frequent downshifting, which is hard on the tranny and not to mention noisy. It also makes your JK thirsty. It's hard for most people to wrap their minds around running a higher ratio and actually getting better mileage but it's true. Do yourself a favor and don't go less than 4.88. Truth be told 5.13 is the more common gear to run 37's with.