Hey everybody. I am looking into upgrading my current gears in my 08 jk 6sp. I overall want to upgrade the axles to the pro-rock 44s but currently that kind of funding is a ways away. I have been looking at either 4.88 or 5.13. What all do I need to make these gearing changes and is it all that difficult to do. Thanks

 

Here is a great write up from another member.. Might help a bit.

And the general consensus is that if you want 35's or bigger go with the 5.13's, it leaves room to grow.

https://www.jk-forum.com/forums/show...5.13-gear-swap

 

D30 R&P + an Overhaul kit
D44 R&P + an Overhaul kit
(install kits are sometimes used on low mileage axles, but you are better off with overhauls for the new bearings. And make sure they are the 'thick' gears for JK's.)


Two more write-ups:

https://www.jk-forum.com/forums/show...8112-It-begins....
https://www.jk-forum.com/forums/show...?82262-Gearing

 

Call Northridge and get a complete overhaul kit. They are Yukon gears, are well priced, great quality, and the shop that installed mine said they set up very easily.

Also another great write up for more info....

https://www.jk-forum.com/forums/show...?82262-Gearing

 

i went to Northridge website, and they are priced good and you do get a lot of stuff with the overhaul kit. might be the direction I will be going. Thanks a lot.

 

Don't just go by the website; call David, he might be running a special that week or may cut your a break on your order. He has done that for me twice and was a very pleasant suprise. One thing I can tell you on your gear swap is that if you have reasonable mechanical ability you absolutly can do this yourself. The hardest part of your time will be interpreting the gear patterns. I can not stress enough how you must get that part right. You absulutly will come to a point where you will want to say "thats close enough", when you get to that point stop and take a break or leave it overnight and come back to it refreshed, thats how important it is to get right. I included alot of pics of poor, good, better, and best gear patterns that may help you when you start your journey. Take pics and let us know how it came out for ya.

 

David is a hell of a guy to deal with. Always willing to take the time to answer your questions and make sure you make the right choices for your JK and what you plan to do with it. David gets two from me.

 

if i did go with the 5.13, will it affect my overall performance. I had some people tell me that I will not have much highway speed. Just wanted to make sure it will not affect anything like that before I make the purchase. This is my daily driver as well as my toy.

 

Go out and measure your tires (actual measured height, not mfg's spec), then plug the numbers into the chart in the Drivetrain FAQ's. And then look at the other 're-gearing a 6 speed' thread here on the first page of threads.

You will find that 'most' manual guys with 35's will recommend 4.88's.

 

Go 5.13, why not, the increase in rpm from 488 to 513 is negligible.