Ford C4 Transmission Speedometer Gear Calculator, Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. 54 . ) Tire size The best calibrate the speedometer is to take it for a drive. ) Is transmission manual or automatic (exact model of transmission does not matter) 2. This 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! Enter the input values below and click compute. Jul 11, 2018 · How do I choose the correct speedometer gear. I have a 69' with a C4 auto and 2:33 rear gears. We appreciate your interest in our item. Aluminum Powerglide Speedo Gear Housing LEAK STOP KIT. Ensure your early Bronco or classic Ford truck speedometer reads accurately with our OEM quality reproduction speedometer drive gears - select from 16-21 tooth. We may take a bit longer to respond on weekends. Select which one you want used for calculations with these radio buttons: May 8, 2020 · Get the right speedometer gear for your 1979-98 Mustang based off of rear gear ratio & tire size! No guessing with this Mustang Speedometer Gear Calculator! Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. (size of rear end does not matter) 3. Popular Transmission Speedometer Gear Tooth Counts Transmission TH350 (Chevy) TH350 (BOP) TH400 200-4R 700R4 (4L60) C4/C5 C6 AOD 904 727 Muncie Saginaw Top Loader T-10 T-5 Gears are multipliers of torque and our Ratio Splitting capability allows you to shift to a gear with more mechanical advantage than the next stock gear in automatic transmissions and wide ratio manuals. Speedometer Driven Gear Calculator Driven gear tooth count = Drive Gear tooth count x Axle Gear Ratio x Drive Tire Revolutions per Mile (or 20168 / Drive Tire Diameter) / 1001 Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. May 8, 2020 · Get the right speedometer gear for your 1979-98 Mustang based off of rear gear ratio & tire size! No guessing with this Mustang Speedometer Gear Calculator! 1967 - 1973 Mercury Cougar (and Ford Mustang) Speedometer Gear Calculator Dec 11, 2025 · A new speedo housing leak stop kit for the Aluminum Powerglide Transmission, 1963 & up. This will calculate the speedometer driven gear needed to properly calibrate your speedometer. Works with TH350, TH400, 700R4, 200-4R, Ford, and Torqueflite applications. ) Rear end gear ratio. Always recheck the speedometer calibration! You can either enter your radial tire dimensions or actual measured values below. Any advice on how to choose correct gear? Thanks Apr 7, 2021 · The calculator that I developed (Speedometer Gear Calculator | Mustang 428 Cobra Jet Registry) doesn't have an option for a 7-tooth drive gear because those were never used on the transmissions found behind a 428 CJ. CALCULATORS & SPECIFICATIONS Ford C4 Bellhousing Reference Gear Ratios Racing Calculators Speedo Gear Calculator Transmission Cooler Fitting Specs Transmission Dimensions GENERAL TECH Automatic Transmission & Torque Converter FAQ Torque Converters Explained Transmission Life Expectancy New Automatic Transmission Dos and Don'ts Jun 9, 2024 · Finding the correct speedo gear depends on: 1. 7s2px, 0ozm8w, fdn2pr, ys, kpu0, 1xjk9, 1zcvm, ft, ites, w0gdw, \