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Not sure what rear end gear ratio you have in your car? This calculation
will give you an idea of the gear ratio in the rear end.
You need to know the rpm's of the motor at a certain speed as indicated by your speedometer. NOTE your speedometer
must be accurate, if yours is not have a friend drive next to you at a certain speed.
This calculation assumes the car's transmission is in drive or 1:1 ratio, no overdrive.