I will be installing my lift in about 2 weeks. I will be running 35's on a 2 dr Rubicon that is my daily driver. I live in San Diego, which can be a little hilly, especially on the way to wheelin' spots. I want gas milieage and torque. Will 4.88's do the trick or should I go 5.13's??????? I will never run larger than a 35" tire. Looking for advice from people with real world experience on the 2 dr JK Automatic. Thanks in advance.

 

4.88 is technically the right ratio for 35's but, if you aren't happy with your jeep's power now, it sure as heck won't be any better once you regear. 5.13's will have your rpm's a bit higher but are still within the proper range and if it were me, i would recommend this route as you will get a boost in power and without going overboard on things. they will definitely help on some of the long highway hill climbs we have in the sd area.

 

That's what I was looking for, more opinions welcome. The last build I did was "overgeared" as well. I loved the torque, gas mileage did suffer though. It's that trade off we all battle with. In the end, I will likely choose torque over gas mileage.

 

i've run 5.13's with 35" tires in the past and intend to do so again on my orange jk. honestly, the mpg didn't suffer too much and certainly not enough to matter to me.

 

i am running 5.13s and i am damn happy with them. they can take hills like a champ.. when i did the 513 i knew i would be replacing my 35s with somthing bigger and thats why i went with 513s. i have noticed that when i take the same inclines now than when i had my 4.10s i have very little to no tire slippage, and belive it or not i still get 14.5-17 mpg

 

I have a 2dr 6 speed and I plan on 4.88's, but the auto is a lot more sluggish. My vote is 5.13's.

 

14.5-17 mpg is plenty good enough for me. My last truck was a heavily modified Toyota and I was getting about 12-14 mpg.

 

Plug your numbers into the chart in the Drivetrain FAQ. You'll see just how minimal the rpm difference is between those ratios. Do yourself a favor and go with the 5.13's.

 

Because of the difference in transmission overdrive gear ratios, 6 speed=4.88, Auto=5.13.

 

Great info. I too am looking to do gears. After reading all the advice on this forum I think 5.13 are the way to go for an automatic.