Ford C6 Speedometer Gear Calculator, Always recheck the speedometer calibration! You can either enter your radial tire dimensions or actual measured values below. Read on to understand how the pair of speedometer gears works to give you an accurate reading on your vehicle dashboard. 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. Oct 3, 2024 · The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and customization. The speedometer works well but is reading about 20 mph too fast (80) at approx 60 mph. The accompanying charts show what gears were manufactured for each type transmission. Aluminum Powerglide Speedo Gear Housing LEAK STOP KIT. Shafts were made with 6-7-8-9 teeth for the speedo. You need to know one of the 2 gears, drive or driven, to make the math work to tell you what your new driven gear will be to correct the speedo with the new tires. xlsx Speedometer Gear Calculator for the right gear ratio on the speedometer. To change the output shaft you need to remove and dis-assemble the trans. Please see our other listings. Speedometer Gear Selector-v3. We appreciate your interest in our item. 1967 - 1973 Mercury Cougar (and Ford Mustang) Speedometer Gear Calculator 1948 - 1956 F1, F100 & Larger F-Series Trucks - C6 Speedometer gear question??? - I recently purchased a 1958 F100 with a 1970 351C and C6 trans. 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. Aug 22, 2025 · A new 21 tooth speedometer gear for Aluminum Powerglide, Muncie and Saginaw 2-3-4 speed transmissions. Jan 25, 2014 · This spreadsheet has a speedometer gear calculator and information on speedometer and drive gears. TCI® now stocks the most po Speedometer Driven Gear Calculator at The Definitive 1967 - 1973 Mercury Cougar Parts Source Speedometer Driven Gear Calculator for 1967 - 1973 Mercury Cougars and Fords Mustangs The form on this page allows you to describe your tire size (modern radials only), wheel diameter, rear end ratio, and transmission type to calculate the combination of drive and driven gears that will give you the smallest margin of error, thus providing the most accurate speedometer. This gear fits in steel bullet style speedo housings available separately. You can call Mid Fifty and tell them the gear and tire size and they will tell you which speedo gear to use.
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