So this whole time i've been dreading the day i move up to 35's because i thought i had 3.21 gears.... But today i just got the news that my 2007 JK sport has 4:10's!!!!! Im soo happy!!!!!!!!!!!!!!!!!!!!!

 

Did you buy it used? Mine 08 X came with 3.73

 

What rear end do you have. Is it a 44 or 35

 

You lucky dog! I thought Rubi's just came with 4.10's.

 

Some 07s came with 4.10s. Some 07s came with Dana 35s also

 

Its got a D44

 

Do you have an auto or manual. A 6 speed with 4.10s on 35s is not bad at all.

 

The only reason i think i have 4.10's and a dana 44 is because i searched my vin on Compnine.com and thats what it told me

 

I have an auto! And yeah im really excited now!
It wont be "as" sluggish...(:

 

The only choices for the '07 model year were 3.21 and 4.10. All the automatics came with 4.10.

If you bought it used, a previous owner could have re-geared it.
An easy way to tell what gears you have:

Chock a rear tire.
Jack a front tire off the ground.
Spin the tire by hand, exactly 2 revolutions while counting the drive shaft turns.
If the drive shaft turns only a tiny bit over 4 turns, you have 4.10 gears.