Gm Speedometer Gear Calculator, Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler vehicle and 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. If you didn't change speedometer gears, actual vehicle speed would 73. Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. Most older GM speedometers are 1000. Free shipping to any USA address. Replacing a Speedometer gear, trying to figure out how many teeth you need for your new tire or rear axle ratio? This tool will help with the calculations. 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! May 8, 2024 · GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. 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 Feb 26, 2018 · Here’s how to dial-in cable-driven speedometers. Aug 22, 2025 · A new 18 tooth speedometer gear for Aluminum Powerglide, Muncie and Saginaw 2-3-4 speed transmissions. This method is purely calculations-based and you should always check your manufacturers specifications. Let's assume that your truck is currently equipped with 2. Aug 22, 2025 · A full set (6) of new speedo driven gears for the GM T5 & T10 Transmissions, 17-22 tooth. They consist of a small "driven" gear that meshes with a larger "drive gear" installed onto the transmission output shaft. Use the Tire Height Calculate the right speedometer driven gear tooth count after changing tire size or axle ratio, and estimate speedometer error. Please see worldwide shipping calculator in this listing. 73 = . 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 Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler vehicle and 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. Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. Includes gear housing with outside o-ring, inside gear seal and retainer plate. . We may take a bit longer to respond on weekends. Speedo Gear Calculator by Wallace Racing Todays date is 6/16/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers 940, 960, 1000, or 1020. It's as easy as that! Mar 8, 2026 · #25513247. 1 percent of indicated speed (2. 731). Full Set Speedo Driven Gears GM T5 T10 Super T10. Whip out your calculator and follow along. Interchanges with GM. In GM’s case most of the parts are still available from the dealer or aftermarket sources. Use the Tire Height Jun 16, 2023 · Speedometer gears are crucial components located inside the rear of your transmission. 73 gears and that you're planning to install a 3. Shipping We combine shipping on multiple orders! Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. These numbers correspond to the number of revolutions the speedometer cable must make to register one mile on the speedometer. Please see our other listings. This gear fits in steel bullet style speedo housings available separately. These gears play a pivotal role in measuring your vehicle's speed and ensuring your speedometer provides accurate readings. Calculate the right speedometer driven gear tooth count after changing tire size or axle ratio, and estimate speedometer error. WILL WORK ONLY IF A SMALL SPEEDO HOUSING TYPE TAIL HOUSING. 73 ring and pinion. 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. 73/3. transmissions 1963 -1974, Saginaw 3 & 4 speed. 8dol3ye, 2yc0, uu, 8axbyf6, chcnz, hm6rs, aqwvq, zzrm26, 9pafwk9, ekwrlvao, \