Brknarrow1970

How can I tell which gears are on my jeep it is an 08 2 door with 35's on it. It had 5300 miles on it when purchased and curios how the gears impact horsepower and gas mileage

drew.couey

Look at your build sheet that will be the easiest!

Hoopa70

unless the previous owner changed them for the 35's..

Running Man

1. Build Sheet
2. VIN
3. Jack up one of the tires and have someone spin the tire one complete time, while you count the number of times the driveshaft makes a complete rotation

Brknarrow1970

and the build sheet is inside the door ?

Sorry a complete noob don't mean to sound like a dummy but at this point it is what I am

Brknarrow1970

actually what I am trying to determine if they were changed with the tires

myz28u

You can jack up jeep. Mark tire and mark drive shaft rotate tire and see how many ttimes droveshaft rotates. If it rotates 3 and 3/4 its 3.73 if its just passed 4 its 4.10 4 3/4 its 4.88. If it 5 thats 5.13 and 5 1/4 is 5.38. Not exact but will let you know if its been regeared.

Mausec

i assume you cant reach the seller, you can always take off your diff cover and check, just a thought?

w squared

That'll work...but it involves a lot of work. New diff fluid, new RTV to re-seal the cover (or a lube locker). Worth it if you want to upgrade your diff cover at the same time, but otherwise a challenging way to go about answering this question.

That's sounding about right. Here's a link to a write-up. Disclaimer: I have no idea what "getahelmet" is about, but google can be your friend too.

http://www.getahelmet.com/jeeps/tech/findratio/

Brknarrow1970

Thanks fellows will have to check that out - which gears seem to work best with the 35's