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RPM vs. Gear Ratio: Engine RPM @ 55 MPH By Tire Diameter
Gear
Ratio
Tire Diameter (inches)
24 25 26 27 28 29 30 31 32 33 34 35 36
2.56 1971 1892 1820 1752 1690 1631 1577 1526 1478 1434 1391 1352 1314
2.73 2102 2018 1940 1869 1802 1740 1682 1627 1577 1529 1484 1441 1401
2.94 2264 2173 2090 2012 1942 1874 1811 1753 1698 1646 1599 1552 1509
3.08 2372 2277 2189 2108 2033 1963 1897 1836 1779 1725 1674 1626 1581
3.21 2472 2373 2282 2197 2119 2046 1977 1914 1854 1798 1745 1695 1648
3.31 2549 2447 2353 2266 2185 2110 2039 1973 1912 1854 1799 1748 1699
3.42 2633 2528 2403 2341 2257 2179 2107 2039 1975 1915 1859 1806 1756
3.54 2726 2617 2516 2423 2336 2256 2181 2110 2044 1982 1924 1869 1817
3.73 2872 2757 2651 2553 2462 2377 2298 2224 2154 2089 2027 1969 1915
3.90 3003 2883 2772 2669 2574 2485 2402 2325 2252 2184 2120 2059 2002
4.10 3157 3031 2914 2806 2706 2613 2526 2444 2368 2296 2228 2165 2105
4.27 3288 3156 3035 2923 2818 2721 2630 2545 2466 2391 2321 2255 2192
4.56 3511 3371 3291 3121 3010 2906 2809 2718 2633 2554 2478 2408 2341
4.88 3758 3607 3469 3340 3221 3110 3006 2909 2818 2733 2652 2577 2505

Source: December 1996 Four Wheeler magazine


AMC Rear Axle Ratio Application Chart