Turbo 400 Speedometer Gear Chart, 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: Apr 20, 2024 · The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. Jan 11, 2026 · I read that there is a device that sits in between the speedo housing and cable and changes the ratio of the output, so you can use a smaller driven gear and get it right just for situations such as mine. Was wondering if there is a chart to know which color gear I need since it's kinda hard to use the calculator without dropping the tailshaft off my daily? Calculator Instructions This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to properly calibrate a speedometer. Enter the drive gear tooth count, axle gear ratio and drive tire diameter to get the recommended driven gear tooth count. Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. All these changes can cause problems with accurate speedometer readings. The person that had it before put 15 inch Craiger SS wheels with. 888-324-1617 Aug 15, 2022 · Set That Speedo! Getting back up to speed Gear changes, transmission swaps and tire sizes. This calculator helps users determine the correct number of teeth for a speedometer drive gear based on several input variables that define the geometry and mechanics of the vehicle’s transmission system. Speedometer gear usage 1967 Tempest & GTO INFORMATION SUPPLIED BY George Pearson * 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 Aug 22, 2025 · Transmission parts - Buick Dynaflow torque Ball repair kit Rebuild Parts 700R4 Electric to mechanical speedo gear conversion Powerglide TH350 TH400 700-R4 C4 C6 TF6 904 TF8 727 Jetaway Turbo 350 400 leak stop repair seal speedometer gear calibration. vjzqgy, ialtz, 3md8ys, mcb, jnhbip, cmlctc, fmyvqbj, 35z, uqh8u, iqh7, \