Raise the tires off the ground. Make a mark with a sharpie on your driveshaft. Count the # of driveshaft revolutions while rotating one tire. The number of times the driveshaft rotates equals the gear ratio. If the driveshaft rotates about 3x, the gear ratio is 3.07. If it rotates 3 3/4 turns, the gear ratio is 3.73.OK so not having much luck, been under the jeep and the back diff has a tag but you can' read it or make it out at all as its rusted and there no tag at all on the front, I tryed the build sheet link again but it' only saying no information found...
Where can I go from here ?