A: Your differential should have a metal tag on the side where the cover bolts on. It will be printed on this LIKE HERE (I have 3.73 gears). If the tag is missing, you can figure it out by lifting both rear wheels off the ground and placing it in neutral (and blocking the front wheels). Then rotate the wheels, watching the drive shaft. You need to count how many times the drive shaft spins in 1 rotation of the tire. The number of times the drive shaft spins will be your gear ratio. Stock ratios are 3.07, 3.55 (pre-'99), 3.73 ('99+), 4.10, and 4.56 ('03+, 4cyl). To help count the rotations, mark the tire, drive shaft and axle with chalk or tape for reference.