Why Is Final Drive Ratio Important? Accelerate Faster!

What is a final drive ratio? What does changing it do?
Car Gears -    • Car Gears - Explained  
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The final drive ratio is typically the gear ratio for the differential, or the final location where the gearing is altered before being sent to the wheels. Changing the final drive ratio heavily impacts the way the car behaves. If you increase the final drive ratio, each gear will have greater wheel torque, while sacrificing top speed. If you decrease the final drive ratio, each gear will have a higher top speed, however deliver less torque. Raising the final drive ratio also means you'll be at higher RPM in your top gear, raising your engine's speed on the highway. You'll also need to correct the speedometer.

How To Calculate The Top Speed Of A Specific Gear In MPH:
Top Speed = ((RPM*60)/(Final Drive*Current Gear Ratio))*((Wheel Size (in.) +(2*(Tire Ratio/100)*(Tire Width (mm)/25.4)))*Pi)/(5280*12)

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