| [ http://www.cargister.com/calculator-gear-ratio?rpm=7000&final_ratio_teeths ][]=&final_ratio_teeths[]=&fdr=4.10&diameter=651.8&ratio[1]=3.21&ratio[2]=1.93&ratio[3]=1.30&ratio[4]=1&ratio[5]=.75&ratio[6]=.6&speed_in=mph&width=275&profile=40&wheel_diameter=17&teeths[1][]=&teeths[2][]=&teeths[1][]=&teeths[2][]=&teeths[1][]=&teeths[2][]=&teeths[1][]=&teeths[2][]=&teeths[1][]=&teeths[2][]=&teeths[1][]=&teeths[2][]= 2580 rpm @ 80 mph 2416 rpm @ 75mph vs 2175 rpm @ 75mph with a 3.69 rear diff 2320 rpm @ 80mph with a 3.69 rear end I used my rear tire size in the calculators, 275/40-17, but I doubt results would be too far off for guys running 16, 18, or even 19 inch wheels unless they are using those creative sidewall heights for whatever reason.
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