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So....here's the math:
Speed[mph] = (RPMengine)/(Gear ratio)/(Rear end ratio)*pi*(diameter of tire[in])*7.33
I don't know for sure if there is or isn't a primary reduction in the tranny or not. But if not, this will be your ground speed. Also, wind resistance is not going to change this number. The force from wind resistance will slow down your acceleration to this speed, and will limit top speed if your engine doesn't have enough power to overcome it. But if your going a set RPM in say 4th gear, do the math and that will be your vehicle speed.
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