I have an 2009 unlimited rubicon and I am getting ready to regear with yukon gears. But I want to make sure I get the correct gears so when I upgrade down the road will not have to redo everything again. I am currently running a rock krawler 3.5 x-factor lift, 35" tires on a 17" rim. I have been thinking of going up to 37"s next spring so would a 5.13 gear be good enough or should I go with the 5.38. I am looking to get my gears ordered prob by monday.

thanks

 

A 3.8 auto going to 37's? Yep, 5.38's were my choice. Right for you? Depends on your usage/needs/location/etc.

 

Auto or manual? I just put 5.38's in my 2011 auto running 35's. It runs soo much better than with the 4.10's. Only downshifts when you would expect it to, not with every little rise in the road. I gained about 1.5 mpg around town. Only time I see any highway is with my boat hooked up, so I don't really know the affect it had on highway mileage.