* AOD is calculated at .70 transmission ratio
* 5 speed is calculated at .80 transmission ratio
* Many late model vehicles have a taller overdrive ratio, such as Toyota Tacoma & Tundra with 6 speed Auto have a .58:1 overdrive.
Use 1:1 RPM x .58 = RPM
| Recommended RPM @ 60mph | |
|---|---|
| 4 cyl | 2200-3200 |
| 6 cyl | 2000-3000 |
| small block | 1800-2800 |
| big block | 1600-2600 |
| GM Duramax 6.2L | 1800-2800 |
| Ford Powerstroke (non-turbo) |
1600-2500 |
| Ford Powerstroke (turbo) | 1400-2200 |
| Dodge Cummins Diesel | 1400-2200 |
This is set to calculate Imperial (US) specifications. Our Metric calculator is here
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These
calculators are designed to give the approximate engine RPM (revolutions per minute) based on the ring gear and
pinion gear ratio, the height of the tires (diameter from ground to top of the tire while mounted on the
vehicle) and the transmission final gear ratio.
This calculator does not take into consideration any
drive train loss, road and weather conditions or driver skills. The calculated results are displayed; the higher
the engine RPM, the greater the potential speed at the cost of fuel, heat, friction and engine longevity. The
results are only an Estimate - Your Mileage May Vary.