mowbizz

2007 Wrangler X 2 door, Automatic. I believe the Jeep came with an "S" package as it is not really a "bare bones" model...it has a bunch of options including a tow hitch (could have been installed by PO)
Anyway, how do you tell? Is there anything the VIN# will tell me?

thom1879

If it's a 2007 it has 4:1 if it is newer it has 3.73:1. You can tell for sure by looking at your diffs, there should be a ring and pinion number somewhere on it, simply divide the bigger number by the smaller one and you'll have your ratio.

mowbizz

Thank you!
I will check it when I can...

roguejk

i have a 07 x 2dr and i believe i have 3:21
but will check using your method.

hammerhead

You can give the dealer you're VIN# and they can look it.

ronjenx

If you bought it used, you don't know if it has been regeared, so the build sheet and VIN search may not be correct.

If you want to know for sure, and remove all doubt, do this:

Chock the front tires, fore and aft.
Put the transmission in neutral.
Emergency brake off.
Jack the left rear tire off the ground.
Put a jack stand under the frame, just in case the jack fails (had to add this).
Put an index mark on the aft end of the drive shaft, visible from the left rear wheel.
Put an index mark on the left rear tire at the 6 o'clock position.
Rotate the left rear tire 2 complete revolutions while counting how many times the index mark on the drive shaft passes its original position.
That number will be your axle ratio.
Remove jackstand and lower jack.
Put transmission in gear or Park, apply emergency brake.
Remove chocks.
If you have limited slip, jack up both rear wheels and rotate one revolution, making sure both tires rotate equally.

If the driveshaft rotated almost 3 1/4 turns, you have 3.21
If the driveshaft rotated almost 3 3/4 turns, you have 3.73
If the driveshaft rotated a little over 4 turns, you have 4.10

ronjenx

Thanks. Feel free to post it anytime this question comes up (if you can beat me to it).

hammerhead

Great info ronjenx, I didn't know that one. I believe the guy asking the question has a Jeep that is still stock and would be 99% sure that the gears would still the factory installed ones. So if it were me with a stock Jeep I would call the dealer with the VIN# for the gear ratio. If you're Jeep is modified with a lift and bigger tires I would double check that with ronjenx direction.

fish

i had an 07 x unlimited with the tow package from the factory and it had 4.10's in it . i guess they put those in when they do the tow package upgrade

ronjenx

That's why I always open the directions with:
"If you want to know for sure, and remove all doubt, do this:"

And, it's a chance to get out there and work on the Jeep.
If someone is not at ease doing something like this, there must be an acquaintance who can help.
I help for food all the time.