Axle Gear Upgrade for 2007 – 2010 Jeep WranglerMay 24th, 2010 by admin
We have just run into a 2007 JK Jeep oddity. When looking to do a gear upgrade on your Jeep, be aware that not all 2007 JKs have Dana 44 rear axles. There are a few that have Next Generation Dana 35s with 4:10 gears from Chrysler. They are easy to spot because the axle cover has a different shape than a Dana 44.
Currently there are no gears, axle shafts, or lockers available for this Jeep. Since they are in such limited supply in the United States, it is doubtful any manufacturer will spend any time or money to make upgrades for them.
This is probably the best upgrade you can make to your Jeep. I had been running 35” Xtreme Mud Terrains with the factory 4:10 gears (Rubicon model) and my power and gas mileage suffered. I tried a programmer, intake, and exhaust to help get back to 18/20 miles per gallon. My power increased, but mileage dropped to 15 miles per gallon. Taking off power seemed OK, but at freeway speeds my automatic would downshift with any incline and it was tough to pass slower traffic with ease.
The fix for this is to run lower gears to get your Jeep back into its power band (around 2300/2400 RPM at 65 MPH in overdrive). My upgrade was to swap out the gears to run 4:88s. You won’t believe the difference in power and economy. I am back to 18/20 MPG on the freeway now and passing power is right back where it should be. This is not something you should try on your own, unless you have experience with differential repairs.
You can contact our retail stores to have the upgrade done for you.