There are four ways to find a ratio.
1 A dealer can normally tell from the vin number.
2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement
info.
3 You can count how many times you have to turn the driveshaft to get one complete turn of the tires.
4 You can divide the number of teeth on the ring gear and divide by number of teeth on the pinion.
Jeep Wrangler only,
The 4 cylinder models have a gear ratio of 4.10:1
3.07 or 3.73 to 1
Could be 3.07, 3.55, or 3.73
4.11's would be perfect.
Could be either 3.55 or 3.73 :1
3:48
final axle ratio 3.55
3.07 or 3.73 to 1. Could be either.
My jeep wrangler keeps loking in gears
I have a 95 and the gear is 4.11. It is on a little placard on the axle diff. cover. Can be either on the front or rear. Good luck.
The tag on the back of the case has the part number, model number and gear ratio on it.