So, for example, what rpm will a stock 94 Impala turn at 75 MPH?
a = 255, b = 50, c = 17, d = 75, e = 3.08, f = 0.70 rpm = ((d*26.7) / ((a*b/500 + c*2.54) * 3.14/100)) * e * f rpm = ((75*26.7) / ((255*50/500 + 17*2.54) * 3.14/100)) * 3.08 * 0.7 rpm = (2002.5) / ((25.5 + 43.18) * .0314) * 2.156 rpm = (2002.5 / 2.156) * 2.156 rpm = 2002.5 Also, as a side note, the Richmond gear sets (and probably other aftermarket sets as well), do not work with the Impala SS reluctor setup. The price o f the Richmond gears is very attractive, about $200 vs about $350 for the GM’s. The Richmond gears themselves will work on the Impala, but your ABS light will turn on and the ABS will not function. Until Richmond redesigns the pinion to accept the reluctor, like the GM gears, they rate as a “NO Buy”. FYI, the “reluctor” on the Impala is pressed on to the pinio n shaft, which turns at driveshaft speed . It is the device that generates the pulse signal to the ABS computer for your rear wheel speed. When you change gear ratios you must also change to a reluctor with the c
