Muncie Speedometer Gear Calculator, Use this handy calculator to find out the speedo gear you should purchase to bring your speedometer back into an accurate range. 84 drive gear mates with the smaller 17-18-19-20-21-22 teeth side gears. This method is purely calculations-based and you should always check your manufacturers specifications. When I build a n Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. Oct 21, 2014 · by Paul Cangialosi (taken from Muncie 4-Speed Transmissions: How to Rebuild and Modify) I’ve seen many people frustrated because they took the time to do a thorough job rebuilding a used Muncie, but later, after the transmission is installed, they find out that the speedometer is reading incorrectly. The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. 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. 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: Speedometer Gear Calculator Input your tire diameter, axle ratio, and transmission drive gear to find the correct driven gear and ensure accurate speedometer readings. A vehicle uses the speedometer drive gear to estimate its speed based on the rotations of its tires. I think most electronic speedo's work that way as well Aug 28, 2017 · For those of you who know Muncies intimately, you know that there are GENERALLY (emphasis on generally) two DRIVE gears: 8 teeth 1. hrx8p, zdzoaj, b9dw, 140sy, z9, vdah, rufh, 8v, y9, 5qu4jvwl,