When i bought my unlimited it already had a teraflex lift and 37's....I recently bought a superchips flashpaq and when i pluged it into my car it asked me to put in my gear ratio and i have no idea what it is how could i find that out? Also what would be the best performance setting to put it on? i usually run regular unleaded

 

hummmmmmmmm I thought you had a jeep

 

I do have a Jeep??

 

People here don't like it if you call your Jeep a "car". It's either a Jeep or a truck.

Is it a Rubicon model? If so it may still be the original 4:10 gears, but with 37" tires there's a pretty good chance it has been regeared. You can jack up the front end and count the drive shaft vs. tire rotations to be sure of what's in the differential. If you need to know how to do this, it's on the forum... I can try to find a link for you.

Did you buy from an individual? If so, ask them if they regeared. I'm guessing you bought it at a dealer though, and don't have this option.

 

ah , I use mine on the 93 octane power setting. love the power. Not sure on the gears, there is a code of numbers on the diff. cover but if it was changed ? . Having a lift and 37,I would imagine 5.13. Do you feel it has enough power?,if so should be 5.13

 

Here is the link:

https://www.jk-forum.com/forums/stock-jk-tech-12/how-do-you-tell-what-gearing-you-have-116629/

Scroll about halfway down the first page, you'll see how to check what you have.
Hopefully with 37s they are at least 4.88s or 5.13s.

 

Okay thanks guys