Turbo 400 Speedometer Gear Calculator Pdf, They consist of a small "driven" gear that meshes with a larger "drive gear" installed onto the transmission output shaft. Calculate the correct speedometer gear for your vehicle using Monster Transmission's tool by entering drive gear teeth, rear gear ratio, and tire height. If in doubt use manufactures posted diameter. This page provides a simple formula to aid in selecting the proper speedometer gears for your transmission application and charts showing the various gears available for each transmission. Ive order 2 different speedometer gears and both are smaller in diameter than one i pulled from trans. These numbers correspond to the number of revolutions the speedometer cable must make to register one mile on the speedometer. The accompanying charts show what gears were manufactured for each type transmission. This calculator takes into account various Tamworth Classic Holden Club 48 - 78 Speedo Gear Calculator Some changes to your early model Holden can result in the speedometer reading being inaccurate - these changes can include changing the tyre and/or wheel size from that originally fitted, replacing the differential with a different ratio, or replacing/upgrading the gearbox. 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: Jun 16, 2023 · What Are Speedometer Gears For? Speedometer gears are crucial components located inside the rear of your transmission. Jun 29, 2025 · I need help. * 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 Jan 11, 2026 · C3 Tech/Performance - Speedo Drive Gear in Turbo 400 - Hi, About to install a rebuilt Turbo 400 (orig trans) in my 71. 08, and want to get the speedo calibrated before it goes in. Speedo Gear Calculator by Wallace Racing Todays date is 8/4/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers 940, 960, 1000, or 1020. Be aware that the same color can be used on gears with different teeth counts. Replace the driven gear with the gear required to return the speedometer to a true speed reading. What do i need to order? Calculator says 38 tooth, current one is 41 tooth and speed off 20mph. Changed out the rear gear to 3. Pics below are comparing old and new. Fits the following transmissions:TH350, TH375, TH400, & TH475Fits cars with mechanical speedometer drive only. 337 - TH350/TH400 Transmission Speedometer Gears The following information is derived from my Chevrolet Parts & Accessories Catalog, circa 1972. Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. Mar 18, 2016 · This is a correct speedometer driven gear, which goes inside the transmission case. Email me if you have any questions or comments. Speedometer gearing charts While typing these pages, I realized there are literally thousands of combinations of speedometer gears. . 36 from 3. Found a good site to calculate the driven gears, but need the size of the drive gear to determine 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. Accurate speedometer gear calculation ensures the speedometer displays the vehicle’s speed accurately, which is crucial for safety, legal, and efficiency reasons. Aftermarket TH400 gears are color-coded; consult your manufacturer's gear ratio chart to determine the color gear you need. TCI® now stocks the most po 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. Calculator for the right gear ratio on the speedometer. Use the Tire Height Chevelle Speedometer Cables | El Camino Speedometer Cables Group 4. These gears play a pivotal role in measuring your vehicle's speed and ensuring your speedometer provides accurate readings. Found a good site to calculate the driven gears, but need the size of the drive gear to determine Mar 20, 2024 · The TH350 speedometer gear calculator is an essential tool designed to help vehicle owners and mechanics calculate the correct speedometer gear for vehicles with the TH350 transmission. Im doing 50mph and gauge says 70mph Jan 11, 2026 · C3 Tech/Performance - Speedo Drive Gear in Turbo 400 - Hi, About to install a rebuilt Turbo 400 (orig trans) in my 71. I ordered a gear for th350 and th400, both being smaller than one i pulled from trans. Im told trans is th400. This method is purely calculations-based and you should always check your manufacturers specifications. Most older GM speedometers are 1000. When I finish typing all the pages, I will try to organize it a little better. xxy, 81af, bhy, nflgd, hqgd, 5tj2pf, yg, 5wet, vfdo, jmzsil,
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