USCG G8R

Just bought a 2012 stock JKUS and not sure how to determine what gears were install by the factory. I have heard that some came with 4.10 or 3.73(or some number similar)

Thanks in advance.

bevan7170

Thank Ronjenx for this...

You can also go to the Jeep website, navigate to my Jeep and entertain your vin. It will give you a build list of what was on yours when sold.

jadmt

you have either 3.21's or 3.73's. 4.10 only avail in a rubicon from the factory.

sillybubba

If you have the factory tow package....then prolly 3.73

jadmt

only if it is the max tow package, my 13 jku had tow package with 3.21's which was a joke as it was limited to 2000 lb tow capacity.

rob_engineer

My experience when shopping in 2012 for a 2012 jku here in NJ is that essentially zero specimens were available in a 200 mile radius that had anything other than 3.21 gearing (except rubis). I absolutely demanded the 3.73 because I knew I wanted to tow with mine. I ended up ordering my jku from the factory because the local dealers were unable to find one on a lot anywhere that had 3.73. With that said, the odds are that your jku has 3.21, but only way to know for sure is to get the build sheet. Tow package means nothing unless it was the max tow package, which came with the 3.73 rear as well as the sway control programming. There is no way to add the sway control programming unless it came from the factory with the max tow package.

ronjenx

If you bought the JK used, the build sheet will only tell you what it had from the factory. A previous owner could have re-geared it.

If you want to know what gears it has now, do this:

Jack one front tire off the ground.

Put a chalk mark on the tire and the drive shaft.
Rotate the tire by hand 2 complete revolutions while counting the drive shaft turns. The number will be your gear ratio.
A little less than 3 and 1/4 turns will be 3.21 gears.
About 3 and 3/4 turns will be 3.73 gears.
A little over 4 turns will be 4.10 gears.

CanadianEh

Try the compnine website


Sent from my iPhone using Tapatalk

Mad Dog 21

Yeah not find this cool area on the website. I have a used 10 jk sahara and I'm trying to get the breakdown as well. Not having any luck.

Mad Dog 21

Well I finally found it. Go to jeep.com. Then click on contact us, then on the left side "your vehicle" click on equipment listing and input your vin. It tells you the basics but not more than you already know. Hope this helps others.