Th400 Speedometer Gear Calculator, It aids in C3 Tech/Performance - Speedo Drive Gear in Turbo 400 - Hi, About to install a rebuilt Turbo 400 (orig trans) in my 71. 73 ratio in my 2WD truck. 08, 4. Was 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. I ordered a gear for th350 and th400, both being TCI GM Speedometer Gears 880011 Speedometer Gear, Driven, 38-Tooth, Blue, GM, 200C, 350C, 375B, TH425, TH400, TH475, 700R4, Each Part Number: TCI-880011 4. 73 axles, just getting the speedometer to work was a win but it's way too high, maybe How To Change Transmission Drive and Driven Gears For Proper Speedometer Reading #gbody #gbodynation #gbodygang As long as your tire diameter measurement is accurate, the speedo chart in the service manual or the TCI speedo will work. Are all steel speedo drives the same tooth count? (15 tooth??). 96K subscribers Subscribed Th400 speedo gear Pontiac - Street The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. 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. 73 axles, just getting the speedometer to work was a win but it's way too high, maybe Th400 question I have just put a 3. Aftermarket TH400 gears are color-coded; consult your manufacturer's gear ratio chart to determine Today is July 3, 2026 This website is designed and maintained by Webs by Dale™ (WBD). 5 out of 5 stars ( 12 ) In So my speedo is reading about 10mph faster than it should. To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate the number of teeth on the The speedometer gear calculator will then estimate the number of teeth needed on the driven gear. A simple to use Transmission Speedometer Gear Calculator. Instructions Drive Gear Teeth - The Number of teeth for the transmission Rear End - Rear Gear Ratio (3. Was hoping not to have try to count with it still in the car. Home Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler vehicle and is very Speedometer Sleeves GM calls the part that mounts the speedometer driven gear to the transmission a Sleeve - Speedo Driven Gear. Im told trans is th400. ) Tire Height - Please use Inches when measuring Speedo Revolutions Per Mile Calculate gear ratio speedometer correction instantly. Speedo Gear Calculator by Wallace Racing Todays date is 7/4/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers Speedo Gear Calculator by Wallace Racing Todays date is 7/4/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct driven gear. The formula This calculator helps determine the correct speedometer drive gear based on tire size changes and axle ratio. 700r4 4L60E The speedometer accuracy is maintained by selecting the correct size driven gear fitted to the gearbox end of the speedo cable - each gearbox has a number of different sized (and colour coded) gear How To: TH400 Speedometer driven gear and seal replacement DavidJWarEagle 3. Calculator for the right gear ratio on the speedometer. Ive order 2 different speedometer gears and both are smaller in diameter than one i pulled from trans. 73 Axle? Dash Speedometer Off, Calculator Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to determine what transmission speedometer gear The TCI Speedometer Gear Calculator determine the number of teeth required on the speedometer gear for achieving a desired reading. Founded in 1991, it was also the first online forum for people to gather and talk about their I need help. Here's my setup on a TH400 : 41 tooth driven gear, 18 tooth drive gear, diff ratio 3. Enter tire size, axle ratio & gear set to get accurate speed readings. And I assumed my speedo would be a bit off once I did it. 73 Axle? Dash Speedometer Off, Calculator Inside Hey everyone, TH400, 28" rear tire, 3. Some Replace the driven gear with the gear required to return the speedometer to a true speed reading. A higher tooth count drive gear increases speedometer reading, while a lower tooth count Hello H Series Guru’s, a question on TH400 transmission. I have a new Product Description CT0554 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 40 tooth driven Turbo 400 Speedometer Housing, Gears, Seals, Help please regarding speedometer drive gear on TH400 Pontiac - Street Product Description CT5418 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 43 tooth driven Turbo 400 Speedometer Housing, Gears, Seals, Put the info into the calculator and plug in say a 14 tooth drive gear and see if the number it gives you matches any they show available. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. TH400 Speedo Gear The 1967 - 1972 Chevrolet & GMC Pickups Message Board The effect of adding or subtracting drive gear teeth on the speedo is exactly the opposite of changing the driven gear's tooth count: Increasing the Chevelle Speedometer Cables | El Camino Speedometer Cables Group 4. Hello Family In today’s video we show you how to locate and use a Speedometer calculator to determine what’s the best gear to use on your DIY Projects. Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. net was created as an informational outlet only. 337 - TH350/TH400 Transmission Speedometer Gears The following information is Hey y'all, I'm dealing with a TH400 for the first time in my personal gearhead journey and am having issues trying to adjust the speedometer driven gear to get the right value on the speedo Replace the driven gear with the gear required to return the speedometer to a true speed reading. 73 in my Camaro and looking for help on TH400 speedo gears Pontiac - Street I get my TH400 back from "The Gear Box". Also, speedometers Speedometer gear parts for 700r4 speedometer gear, TH350, TH400, NP208, NP203, Ford C4 C6 AOD, Muncie, Saginaw, Dodge 727 904 46RH 47RE 46RE The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. 11, etc. 25, and rear tyre is a 235/60/15. This calculator helps users Here’s how to dial-in cable-driven speedometers. I then install the speedometer "Drive" and "Driven" gears. ChevyWorld. They consist of a small "driven" gear that meshes with a Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings and optimal vehicle performance. Founded in 1991, it was also the first online forum for PY Online Forums - Bringing the Pontiac Hobby Together > General Classic PONTIAC TECH > Pontiac - Street > Th400 Speedo Gear For 3. I went from a 2. Founded in 1991, it was also the first online forum for The speedometer accuracy is maintained by selecting the correct size driven gear fitted to the gearbox end of the speedo cable - each gearbox has a number of different sized (and colour coded) gear How To: TH400 Speedometer driven gear and seal replacement DavidJWarEagle 3. 56 gear to a 3. Aftermarket TH400 gears are color-coded; consult your manufacturer's gear ratio chart to determine Th400 Speedo Gear For 3. Th400 Speedo Gear For 3. 08 rear end behind a TH 400 which I believe is a 1:1 as a 3 speed. Transmission - Proper speedo drive gear - Running a 3. Is there a way to calculate 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 Gear teeth for speedometer come for several transmissions, among that 2004R, TH350, TH400, 700R4, Torqueflite and Ford-units. The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and customization. Note: The output of the calculator is rounded off to the next integer. Use the Spicer Transmission Ratio RPM Calculator to determine your engine’s RPM based on the transmission gear ratio, tire height, MPH, and ring and pinion gear . The Calculation is based on knowing the number of revolutions required for the speedometer to go Going to put some common transmission gears ratios here for you so that you can play with the calculator. The THM400, TH350BOC & 700R4 uses two sizes which take care of Discover the best speedometer gear ratio for your vehicle with our Speedometer Gear Calculator. 89, 3. 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 Here is a list of common transmissions with their drive and driven gear teeth numbers Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. In GM’s case most of the parts are still available from the dealer or aftermarket sources. Ensure accurate speed and performance. I use this to calculate shift points for the computer controlled transmissions. Changed out the rear gear to Speedometer gears are crucial components located inside the rear of your transmission. Free calculator with preset The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. (About 10ish mph) My TH400 has an electric speedo instead of a cable.
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