Ford C6 Speedometer Gear Calculator, Please see our other listings. Select which one you want used for calculations with these radio buttons: The following formula will work for any GM, Ford or Chrysler vehicle and is very useful when there is no established baseline from which to work from such as replacing a transmission in a vehicle that was purchased without a drive line. Free shipping to any USA address. Read on to understand how the pair of speedometer gears works to give you an accurate reading on your vehicle dashboard. Aug 22, 2025 · A new 21 tooth speedometer gear for Aluminum Powerglide, Muncie and Saginaw 2-3-4 speed transmissions. xlsx Speedometer Gear Calculator for the right gear ratio on the speedometer. I don't Calculate the correct speedometer gear for your vehicle using Monster Transmission's tool by entering drive gear teeth, rear gear ratio, and tire height. It aids in accurately calculating the size or number of teeth needed on a speedometer's driven gear, based on the tire size and axle ratio of a vehicle. Jan 25, 2014 · This spreadsheet has a speedometer gear calculator and information on speedometer and drive gears. Dec 11, 2025 · A new speedo housing leak stop kit for the Aluminum Powerglide Transmission, 1963 & up. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate the number of teeth on the driven gear (round to the nearest available gear): Use the following formula to calculate "tire revolutions per mile" for the formula above: * The "Drive" gear is located on the transmission output shaft and directly turns the Driven gear ** The "Driven" gear is usually located in the transmission housing and directly drives the speedometer cable Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. The speedometer works well but is reading about 20 mph too fast (80) at approx 60 mph. Shipping We combine shipping on multiple orders!. Please see worldwide shipping calculator in this listing. The current gear is 16 The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler vehicle and is very useful when there is no established baseline from which to work from such as replacing a transmission in a vehicle that was purchased without a drive line. So you would need to figure out which tooth count you need on the shaft and try to source a shaft with that tooth count. The accompanying charts show what gears were manufactured for each type transmission. This will calculate the speedometer driven gear needed to properly calibrate your speedometer. This ensures that the speedometer displays the correct speed, especially after Nov 28, 2023 · The C6 speedo gear on the output shaft is not removable.
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