Diff Ratio Calculator. Select a ratio 3 42 3 545 3 73 3 900 3 91 4 100 4 11 4 375 4 555 4 56 4 625 4 880 5 13 5 29. Enter diff gear ratios and tire diameter then drag rpm slider to calculate speed from rpm.
Choose what to calculate then fill out the remaining inputs and click calculate. Our differential gear ratio calculator can help you select the correct gear ratio to maximize the performance of your vehicle. Tire diameter in inches radius x 2 mph calculate.
If required you can manually enter your transmission gear ratios in the fields below.
Rpm diff ratio overdrive ie. This calculator allows you to enter 3 of four variables and it will compute the other based on your input. All orders include order tracking. 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.