1. Check the vehicle's owner's manual. The rear end gear ratio is usually listed in the vehicle's specifications section.
2. Look for the gear ratio stamped on the rear axle housing. This is usually found near the differential cover. The gear ratio is typically expressed as a ratio of the number of teeth on the ring gear to the number of teeth on the pinion gear. For example, a 3.55:1 gear ratio means that the ring gear has 3.55 teeth for every one tooth on the pinion gear.
3. Use a calculator. There are a few online calculators available that can help you determine the rear end gear ratio of your vehicle. You will need to know the vehicle's tire size and final drive ratio.
4. Use a paint stick. If you have access to a paint stick, you can also use it to determine the rear end gear ratio. Follow these steps:
* Jack up the rear of the vehicle so that both rear tires are off the ground.
* Mark a line on the driveshaft and a line on the differential cover.
* Rotate the driveshaft one full turn.
* Count the number of times that the line on the differential cover passes the line on the driveshaft.
* The rear end gear ratio is equal to the number of times that the line on the differential cover passes the line on the driveshaft.
For example, if you rotate the driveshaft one full turn and the line on the differential cover passes the line on the driveshaft 4 times, then the rear end gear ratio is 4:1.
