* Check the sticker inside the driver's side doorjamb: This sticker often lists the axle ratio. Look for something like "Axle Ratio:" followed by a number like 4.10, 3.73, or 4.56.
* Look at the build sheet (if you have it): The original build sheet will specify the axle ratio.
* Check the differential: This is the most definitive method. You'll need to look at the tag on the differential itself (usually located on the top or side). This will show the axle ratio.
Without access to one of these sources, it's impossible to give you the correct gear ratio.
