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RPM vs. Gear Ratio and Tire Height

This chart shows you the cruise rpm at 60 miles per hour based on gear ratio and tire height. For maximum performance with less converter slip at the lockup point, your converter's stall speed should stall close to these figures. If the gear ratio and tire size you want to use isn't on the chart, use the following formula to calculate cruise rpm:

MPH x Axle Ratio x 336
Tire Diameter

Rear Axle
Gear Ratio
Tire
Diameter
24" 26" 28" 30" 32" 34" 36" 38" 40" 42" 44"
2.18 1831 1690 1570 1465 1373 1293 1221 1157 1099 1046 999
2.50 2100 1938 1800 1680 1575 1482 1400 1326 1290 1200 1145
2.74 2301 2124 1973 1841 1726 1625 1534 1545 1381 1315 1255
3.08 2587 2388 2218 2070 1940 1826 1725 1634 1552 1478 1411
3.23 2713 2504 2326 2170 2035 1915 1809 1714 1628 1550 1480
3.50 2940 2714 2520 2352 2205 2075 1960 1857 1764 1680 1604
3.73 3133 2892 2686 2507 2349 2212 2089 1979 1880 1790 1709
3.90 3276 3024 2808 2621 2457 2312 2184 2069 1966 1872 1787
4.10 3444 3179 2952 2755 2583 2431 2296 2175 2066 1968 1879
4.56 3830 3536 3283 3064 2873 2704 2554 2419 2298 2189 2089
4.88 4099 3784 2513 3279 3074 2894 2733 2589 2460 2236 2139

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