i have a 2007 auto jk 4 dr

i know there are alot of threads about this already but im wanting to pull the trigger on something asap so any help is appreciated!


I drive maybe 30 miles a day, a mix between highway and 20-40 mph drving

i have heard 5.13s are a good option or 4.88?

what do yall think? i also just ordered a superchip so that shoulld help a little as well

thanks for the help!

 

Depends on what size tires your running. I'm running 37's with 516 gears and at 70 I'm at about 2600 with 6 speed trans. Now I have the 3.6. If you have auto and 3.8 it will be different. There are charts for this though. Just google it you will find it

 

Not sure what tire size, but here's the gear chart from the FAQ.

 

Need to know tire size.

 

sorry guys 35 inch MTRS

 

I'd say 5.13's since you can have the ability to upgrade to 37's one day. Plus your tires are closer to 34's when measured out and thats the top end for 4.88 gears.

 

Is 5.13's good to put in a Dana 30 front end. I have been told that in an auto with Dana 30 is a bad idea?

 

09 JKU auto 35's is what I have same type of driving as you do and after spending lots of time out here getting opinions and talking to a couple good mechanics who work on jeeps mostly...... 5.13 all the way and very happy with my choice. Good Luck

 

Thanks a lot for the help! I'll probably end up doing 5.13s!

 

Cool. Thanks.
I'm not real familiar with gears. Again I was told that for a Dana 30, 5.13's would be real tight in the diff. housing and that it would have very little tooth contact. Is that true and is that something to be concerned about. I dont beat it up, usually slow and steady. and my wife drives it as her daily driver for now.

Thanks again. It looks like I'm going with 5.13's. again. It's like a game of tug-o-war in my head.