5.13 for 37 is the best setup for sure.

 

X2 on 5.13's. You'll want the stronger pinion for if you ever do some hard offroading, the 5.38 pinion is very small and the weak link in the chain. And 5.13 wouldn't be bad as far as on-road performance and gas mileage with that size tire, regardless if you go down or up a couple of inches in tire size in the future...

 

Just had 5.38's put in last week. Very Happy. 2009 Rubi Unlimited with 37's. Daily Driver.

 

5.13's with my 37x13.50x17 Nitto Mud Grapplers. Add Superchip Flashpaq with 87 or 91 tune to breathe some life back also.

 

I have 37's with 5.13's Auto and it is by no means a sports car. I want to switch to 5.38's. if you have any long grades you drive regularly, you will want the 5.38's for sure. It's a jeep and it going to get bad MPG with the larger tires anyway. If you want better MPG, then buy a hybrid. I don't mind 12 -15 MPG myself.


Just my 0.02¢

 

I have 37's with 538's perfect combo with a pro cal ,

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I have had 5.38 gears and 37's since 500 miles on my 09 and Never regretted it. 5.38 for auto trans great. If I had a manual I probably would do 5.13

 

I have 37s with 3.73 and its slow but I'm the type that doesn't go over 65in the Jeep anyways so I'm happy with my Jeep and ill be ecstatic when I go to 5.13s. Any of y'all run ur tires on stock gears for awhile notice a MPG can't with regearing? I'm at 15.5-16.5 now and wondering if the 1k I drop on gears will pay for itself in cash as well as fun lol