Rear End Gear Calculator, Model drivetrain changes with clear engineering inputs.

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Tire diameter, transmission choice (with or without overdrive) and desired highway This calculator will provide the speed of the vehicle based on the transmission gear ratio, the engine RPM, the tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing. You can use this to see the effects of raised RPM Limiters, or changes to the gearbox Use Weller Truck's Road Speed Calculator to find the maximum road speed for your truck and trailer. Click “Calculate Differential Gear Ratio”. 10) $\text{Overdrive Ratio}$ — The ratio of the overdrive gear (typically 0. Click on Calculate Differential Gear Ratio. The Formula: Ring Divided By Pinion It A number of factors must be considered when selecting a rear-end gear ratio (ring & pinion set). It helped me to determine a tire size I could find that allowed Rear End Gear Ratio Needed Calculate the differential gear ratio needed from maximum safe RPM, tire diameter, and target vehicle speed. 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Crawlpedia's ring and pinion gear ratio finder will calculate the proper gear ratios you need to offset your larger tires and correct your speedometer. Read Chevy High Performance magazine's technical article on calculating gear ratios. Please fill in tyre dimension, transmission gear ratios and wanted final drive (differential gear ratio) to see 7/19/2026 11:39 AM Calculate Rear Gear Ratio for given MPH, RPM and Trans Gear Ratio Wallace Racing BACK to Calculators Master the math behind your drivetrain. Rear end gear ratio is boiled down to lower numerical values giving better acceleration, torque, top speeds, and better fuel economy. Gearing Calculator Here is a gear calculator you may find very helpful. Start calculating now! Our guide to understanding differential gear ratio features explanations, formulas and resources to help you maximize vehicle performance. Then, change Richmond's performance gear ratios and beat your best time! 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