Im having 5.13 gears put in my jeep and i want to know what or how i can tell the difference if 4.88's were installed and not the 5.13's that are suppose to go in on a 2 door wrangler automatic with 35" tires,how will i tell if the correct gears were installed ?

 

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

Chock the right rear tire, 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 and/or apply emergency brake.
Remove chocks.

If the driveshaft turned slightly more than 5 turns, they must be 5.13's

 

What the guy above me said X1000000000000

But to add//// I think you meant the 4:10's the auto's with towing....none come with 4:88's that I know of................

 

being that you have an automatic, you really should have your computer recalibrated/speedo after regearing and getting new tires. this will change the way it drives and i think you will be able to feel the difference a lot more.

 

Does the dealership do that

 

buy the hypertec ! it does it all + hp +mpg

 

Not to get in your business, but if you don't trust this someone to put the right gears in your Jeep then why let them even touch your jeep?

 

X 2 if you don't trust the guy i would not have him working on my jeep.

 

No, dealership can't handle tire sizes > 32". The hypertech speedo calculator is useful, not too expensive, and very easy to use.

 

How does having the speedo calibrated to the tire size change how it drives?