4x4 Gear Ratio Calculator
When you install larger tires on your 4x4, your engine has to work harder, and you lose mechanical leverage (torque). To restore your vehicle's factory performance, fuel economy, and transmission shift points, you need to change your differential gears. Use our accurate Gear Ratio Calculator to find the exact ring and pinion ratio you need.
Effective Gear Ratio Calculator
Why is changing gear ratios important?
Installing larger and heavier tires effectively changes your final drive ratio. This results in sluggish acceleration and puts extra stress on your transmission. Re-gearing your axles brings the mechanical advantage back to factory specs, ensuring longevity and proper off-road torque.
Disclaimer: This calculator provides the mathematically ideal gear ratio. Since ring and pinion gears are only manufactured in specific ratios (e.g., 4.10, 4.56, 4.88), you will need to choose the closest available ratio for your specific axle model. Always consult a driveline specialist.