I know this thread is already out there, but I couldn't find it?
I have a 2012 4 door with a 4.5 AEV lift and 37" Nitto Trail Grapplers.
What gears are people running with 37's and their 3.6 Pentastar? 4.56 or 4.88? I'd like to keep it close to stock rpm's

 

I run 4.10's in my 13' jku sport on 37's I don't really have any complaints about street driving, I get great gas mileage. I will say that my crawl ratio off road could stand to be lower. So if I had to do it again I would go with 4.56's.

 

if you have a man trans 4.56 will work and 4.88 if you have an auto. Also depends on what type of terrain you wheel and the type of roads you drive hills, mountains etc. I have a 12 w/ auto with 5.13 and 37 nitto mud grapplers and love it, doesn't downshift as much going up hills. It does about 3200 rpm at 75

 

What are you getting for MPG?

 

you havent said whether you have a manual or auto

 

Also I am running a manual, no auto. Makes a big difference.

 

If I drive 65mph 17mpg, if I go 80 it drops to 12.5mpg according to the dash info thing.

 

Thank you.

 

I have a 13 JKR manual. Running 4.10 with 37's

I have zero complaints. Cruise 70 at about 2100rpm give or take. And no down shifts necessary for mild hills on freeway

 

I have a 2012 auto running the 4.88's and average around 14-15 mpg driving 75 mph. If I were to do it again I would do the 5.13's just for the long mountain passes around here.