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Kevin063 01-06-2013 10:16 PM

Want to help me out?
So I'm probably going to sound stupid, but I need some help. Can somebody please explain to me the "3.73, 4.10, or 4.88" when I read about the gear diffs (in layman's terms!!). Like, is the higher number the better ooooor.......?
I've been trying to read up on all this. but I don't understand the impact on the axles with the tire size and what not.

I'm looking to up my tire size, and I'm running a totally stock 4cyl 1997 SE, with the exception of tire size (mine being somewhere in the neighborhood of 29.5").
So, I've read that I might have 4.10? I'm gonna check for sure tomorrow, but can somebody just walk me through the impact that say 31" to 32" tires would have on my jeep? :doh:

I hope this makes sense, and any help would be appreciated. Thanks guys.

Moabrubi 01-06-2013 10:22 PM

This one is good...

How a Differential Works and Types of Differentials - YouTube

My favorite one:

How Differential Gear works (BEST Tutorial) - YouTube

Once you watch these videos you will understand the basics. Then you can figure what ratio you need and more importantly why you need it :).

BLK00TJ 01-06-2013 10:23 PM

all that refers to gear ratio. how many times the axle turns compared to how many times the driveshaft turns. For example, on a 3.73 ratio, for every singe revolution of the axle, the driveshaft spins around 3.73 times. For bigger tires you want a higher number. Smaller tires you want a lower number. I'm not much up on what gears you'll want for a 2.5 and 31/32" tires, but the ones who know will be responding shortly asking what your transmission is (auto or 5 spd).

Sycboi 01-06-2013 10:29 PM

2.5 liter automatic should be 3.73s, and 2.5 liter manual shift should be 4.10s. I have a '97 SE w/stock 3.73 gears and Yokohama 31" AT/S tires and it isn't too bad, but I only street drive...

Kevin063 01-06-2013 10:32 PM

Mine is a manual, I knew I left something out.
So 31/32"s shouldn't be a problem, or would it??

Sycboi 01-06-2013 11:15 PM

Street driving will be fine. Once you get up to 33's with stock gears you start loosing the use of 5th gear...

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