If i don't have a build sheet or window sticker what other way can i tell what gear is in my 2009 X? I bought it used and have no idea...

If you are considering 35's, get 35's. (my 315/75/16 bighorns measure 33.5", so don't mess with 33's or 34's)

The only consideration is IF you are going to regear?
Yes. Regardless of when - get the 35's.
No. Get the 35's anyway and live without 6th... :brows:

Here ur answer. Click the photo to see the pic correctly.

.4lo.com/calc/geartire.htm[/url]

That is most definitely NOT the answer...


Use the charts in the faq's and read the thousands of posts from people who actually have JKs and run these gears and tires in their JK's. I would be thoroughly pissed off if I spent $1500 and re-geared to the ratio that generic calculator suggested...

It's a basic calculation, those numbers will get ur gears back to a stock set up, if u read it gives a high side and a low side they say use the low side.. its a tire verses gears which gives u a close recommendation.. so adjust according to tranny difference and planed use.. obviously its not set in stone.. so relaxe turbo

It said 456 for me on 35's I'm goin 488's little lower but still street-able so it was correct.. and that was my original plan anyway. Was just testing it

So take that number do a little research, adjust to ur needs and go buy.. anyone that would take that number and just go buy shouldn't b messing with modifications

http://www.jeep.com/webselfservice/j...m('R')

Go to this page on Jeep's website, click on the Send Us and Email link, and fill out the info. Just tell them you bought it used and you'd like a build sheet. They should get back to you in a few days. It saved me a lot of trouble!

Well I would go measure them if I could but I'm out in Virginia for a while. I'll see if there's a tape measure around the hotel, and if so, I'll measure them. As far as sticking out, maybe an inch, and the wheels are 4.5 backspacing.

Play with it some more. How about stock 3.73's and 32" tires, going to 35's. Pretty common setup, right? It says to go to 4.08. (we'll call it 4.10, which is the stock rubi ratio). Accurate? Not even close. The 'low' gear choice is 4.45. (we'll call it 4.56, since that is available for the JK). Again, is that accurate? Not even close for my unlimited auto.

How about 3.21's and 29" tires, going to 35's? It recommends 3.87, and a low of 4.22. Accurate? Nope. The only JK it is remotely close to is a 'manual' rubicon. So should auto rubi's and any other gear/tire combination spend their money based on that info? :bleh:

That is a generic calculator that has absolutely nothing to do with the engine or transmissions on the JK...

Most of them say it works fine because they haven't run a regeared JK. As others have said once you add 35" tires, 513 gears is the best improvement to performance you can do. The CAIs, etc are a waste of money. A programer helps get the most out of the gear change.

You have to ask yourself why those who haven't regeared say it isn't needed, and why none of those who have regeared regret doing it. My JKU with auto is more responsive and better performing with 35s, 513 gears, and Superchip than it was when stock. I wouldn't have kept it in stock form. Now I look forward to driving it.