Summit Racing Speedometer Gear Calculator, The units are available in a variety of gear ratios for different applications. Drag Racing Calculators,Calculators to find 1/4 mile ET and MPH, CID,Piston Speed,gear ratio,carburetor size,margin of victory,Engine calculator, Calculates relative horsepower, air density, density altitude, virtual temperature, actual air pressure, vapor pressure and dyno correction factor and more. These gears play a pivotal role in measuring your vehicle's speed and ensuring your speedometer provides accurate readings. What speedo gears should I buy? Speedometer Gear Selection Older vehicles use mechanical speedometers. These transmissions are shipped without the speedometer driven gear or it’s housing. * 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 Gear Ratio Calculator Ring-and-pinion selection made easy! Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Just type in your info (example: 5000 RPM), press calculate, and you’ll get the right ratio without the guesswork. They have 2 gears that work together to measure vehicle speed. We give you a new "bullet" and a nice assortment of drive and driven gears to accommodate most street gear ratios and tire sizes. Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. 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: SUM-700321 TH-350 Speedometer Gear Kit Selec on Chart and guideline Thank you for purchasing our speedometer gear kit. bp4g, vb5, ah, rimauo, r68, m54dtn4, 0gcr, wea, poxz, tw,