Ring and Pinion Gear Finder
Enter your original tire size and gear ratio into the form below along with your new tire size to find your recommended ring and pinion gear ratio.
Gear Ratio Calculation Basics
Your axle gear ratio determines how many times your driveshaft needs to rotate in order to complete one full tire rotation (a 3.73 gear ratio requires 3.73 driveshaft rotations to turn your tires 360 degrees). Gear ratios have an effect on power, fuel efficiency, engine RPMs, and speedometer readings, so when you change tires sizes, up or down, keep in mind that these things will be impacted. While a small change in tire size may have almost no effect on your vehicle, installing 37" tires on a truck that originally came with 31" tires will result in a feeling of less power, lower operating RPMs, and a speedometer that is off by a few percent. Changing to a numerically higher gear ratio, as calculated below, will correct these problems.
Popular OEM and Aftermarket Gear Ratios
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Helpful Gear Changing Tips
- Bigger tires aren't the only reason to change gears, many truck owners swap gears for better mileage.
- If your vehicle is a 4x4, you will need to change the gears in both front and rear axles.
- Most front axles require reverse cut gears because front driveshafts typically spin the other way.
- Front and rear gears can be different by 1% on highway and 2% off-road without sacrificing performance.