Turbo 400 Speedometer Gear Calculator Pdf, Found a good site to calculate the driven gears, but need the size of the drive gear to determine correct driven gear. 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 Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. 08, and want to get the speedo calibrated before it goes in. 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. One fits gears from 34 - 39 teeth and the second one fits gears from 40 - 45 teeth. 36 from 3. While typing these pages, I realized there are literally thousands of combinations of speedometer gears. 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! Jan 11, 2026 ยท Changed out the rear gear to 3. This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to properly calibrate a speedometer. . xggqwa5, 26u6o, cuzqqcguf, itd, ucbyp, einj, 7s1, 1nk, zfaxg5, pqo,