Gear Ratio Guide

This chart is based on 65 MPH and a 1:1 gear ratio, on manual transmission (4th gear). Please NOTE: If your vehicle is equipped with an automatic transmission the RPM will be higher than shown on the chart, because some slippage will occur in the transmission and torque converter. With overdrive transmission, your RPM in overdrive will be 15 - 30% less than indicated, depending on the vehicle.

Gear Ratio
Tire Size		2.73	3.07	3.55	3.73	4.11	4.27	4.56	4.88	5.13	5.29	5.38	5.71
	28"	2129	2395	2769	2909	3206	3331	3557	3806	4001	4126	4196	4454
	29"	2056	2312	2674	2809	3095	3216	3434	3675	3863	3984	4052	4300
	30"	1987	2235	2584	2715	2992	3109	3320	3553	3735	3851	3917	4157
	31"	1923	2163	2501	2628	2896	3008	3213	3438	3614	3727	3790	4023
	32"	1863	2095	2423	2548	2805	2914	3112	3331	3501	3610	3672	3897
	33"	1807	2032	2349	2489	2720	2826	3018	3230	3395	3501	3561	3779
	34"	1754	1972	2280	2396	2640	2743	2929	3135	3295	3398	3456	3668
	35"	1704	1916	2215	2328	2565	2664	2845	3045	3201	3301	3357	3563
	36"	1656	1862	2154	2263	2493	2590	2766	2961	3112	3209	3264	3464
	37"	1611	1812	2095	2202	2426	2520	2692	2881	3028	3123	3176	3370
	38"	1569	1784	2040	2144	2362	2454	2621	2805	2948	3040	3092	3282
	39"	1529	1719	1988	2089	2303	2391	2554	2733	2873	2962	3013	3198
	40"	1491	1676	1938	2037	2244	2331	2490	2664	2801	2888	2937	3118
	41"	1454	1635	1891	1987	2189	2275	2429	2599	2733	2818	2866	3042
	42"	1420	1596	1846	1940	2137	2220	2371	2538	2668	2751	2798	2969
	43"	1387	1559	1803	1894	2087	2169	2316	2479	2606	2687	2733	2900
	44"	1355	1524	1762	1851	2040	2219	2263	2422	2546	2626	2670	2834

	Highway Driving, Good Fuel Economy
	Daily Driver, Best Overall Performance
	Towing and Power, Reduced Fuel Economy