Just found out some great news!!!!
JK Enthusiast
Joined: Mar 2012
Posts: 445
Likes: 0
From: Copperas Cove, TX
JK Junkie
Joined: Jul 2011
Posts: 2,110
Likes: 0
From: Indianapolis, in
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.
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.
