To find the gear ratio for *your* specific truck, you need to:
* Check the sticker on the driver's side doorjamb: This sticker often lists the axle ratio (e.g., 3.73, 4.10). This is the gear ratio you're looking for.
* Look at the vehicle identification number (VIN): A dealer or a service department can use the VIN to look up the original specifications of your truck, including the axle ratio.
* Check the differential tag: The differential itself (located in the rear axle) usually has a tag indicating the gear ratio. You might need to get under the truck to see it.
Without this information, any number I provide would be a guess and potentially incorrect for your truck.