Speedometer Gear Calculator 700r4, By inputting specific parameters, the tool accurately provides the necessary I need some technical help, I am using a 700R4 tranny in my 56 Chevy PU. Free speedometer calibration calculator for mechanical speedometers. I plan on using the original speedo in my 59 apache, but have a 700r4 tranny, it is out of Use CalcsHub. Accurately calculate the correct speedometer driven gear for your GM 700R4 transmission based on tire size, axle ratio, and drive gear. Has anyone done this conversion on their trifive? I have a 1992 700r4 that is electric and I want to change over to mechanical. 7K subscribers Subscribe Transmissions and Drivetrain - 700R4 Speedometer Gear Change - I have an 88 GTA with 700R4 and Borg Warner 9 Bolt 3. 4dr Belair I just Speedometer Gear Calculator Input your tire diameter, axle ratio, and transmission drive gear to find the correct driven gear and ensure accurate speedometer readings. Ensure accurate speed and performance. This will only be approximate of your corrected speed. It aids in A simple to use Transmission Speedometer Gear Calculator. The tranny is electric. 73's to 3. Put car on jack stands or lift. Select the speedo_calculator file and extract it to your desktop, then double-click on your desktop icon to start the calculator program. I found a calculator for a 700R4, and a way to estimate which gear you need based on how far the speedo is off. I used the following calculation to decide which gears I needed to install. Interchanges with GM #25513247. I bought an aftermarket off eBay appropriate for my driven gear (42 I believe also if you change gears in your differential and or if your speedometer is off your transmission guy can correct that for you with the correct set up of what your looking for. Muncie M20, M21, M22 4 speed transmissions 1963 -1974, Saginaw 3 & 4 speed T5, T10. How Return to the gear ratio calculator This form allows you to calculate tooth counts for mechanical speedometer drives. . Please leave comments or questions thanks Suspension and Chassis - speedo gear tooth count and colors - i need the colors and tooth count for the speedo gears, i need them for a 700r4, 89 9bolt 3. net: RPM calculator. BETA RELEASE send any comments or suggestions to the email address 700R4 & 4L60e Speedometer Gear & Bushing Replacement 3rd Gen Guy 24. Simple if u know rear end ratio and number of teeth on drive gear. it is also dripping fluid. This calculator helps users determine the correct number of teeth for a Calculator Instructions This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to 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 our free 700R4 speedometer gear calculator to find the correct driven gear teeth for your transmission based on tire size, axle ratio, and drive gear. S. We source our 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 ratio. These “Speedo Gears” are usually located in the 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. The driven gear is 42 tooth. Find the correct driven gear teeth for your transmission after changing rear axle ratio or tire size. My car has a 700R4 in it and the speedometer drive was all buggered up. 27 (GW6 code). color of drive gears gray 15 teeth red 17 teeth blue 18 teeth . Speedo Gear Calculator by Wallace Racing Todays date is 6/12/2026 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 6/12/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. 08, 4. The THM400, TH350BOC & 700R4 uses two sizes which take care of Calculate the right speedometer driven gear tooth count after changing tire size or axle ratio, and estimate speedometer error. Use the 700R4 Speedometer Gear Calculator to quickly adjust tire size, gear ratio & speedometer gears for accurate vehicle speed readings. 4 This is the reference document Speedometer Gear Calculator Identify the correct driven gear to calibrate your mechanical speedometer after a gear or tire change. com's Speedometer Gear Calculator to quickly calculate your vehicle’s gear ratios, speed, and performance. Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings and optimal vehicle performance. SPEEDOMETER GEAR CALCULATOR Speedometer Gear Calibrator The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and customization. I cannot find this style drive gear though. Stop guessing and avoid speeding I have just about decided to change from a 2. Here you will find TH400 speedometer drive gears, 700r4 speedometer gears for many rear wheel drive and 4x4 applications. Remove the speedometer cable and driven Here is a photo of all the parts you are required to remove from the tranny in order to change the speedo gears. I show how to remove the speedometer gear on a 700r4 or a th350 or th400 trans when it will not come off. Today at Alf's Mustang Garage, we are calculating the correct speedometer driven gear for our 1967 Ford Mustang. 70. I use this to calculate shift points for the computer controlled transmissions. Anyone know what kind of speedo drive gear this is? Transmission is a 700R4. What gear should I use? I have a 700r4 with what I am pretty sure is a 355 rear gear. Perfect for car enthusiasts, mechanics, and engineers. Ensure accurate speed readings and odometer accuracy. They have 2 gears that work together to measure vehicle speed. According to the calculator at Bowtie I should have a 17/39 combinations with my Gearing Calculator Check to see how far off your speedometer is with your new different size tires. Thanks Matt!! Thats the method and calculator I used to determine the 15-41 combo. After changing the rear gears from 3. Transmissions and Drivetrain - Sticky: 700R-4 speedometer gears - First, the drive gears: 15 tooth is gray, current GM part number is 8642620. ) Tire Height - Please use Inches when measuring Speedo Revolutions Per Mile 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 are crucial components located inside the rear of your transmission. Ship. 31 to 3. Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. 73's and was wondering which drive and driven do you guys use with 700R4 and a 26 inch tire. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. I decided to figure This kit will convert your 1980s or early 1990s 700R4 / 4L60 electric speedo setup back to the original mechanical setup so you can get a proper speedometer reading on your older vehicle. Speedo housing is correct. Depends on the accuracy of tire size diameters. I just put a 700r4 in my 65 SS and I couldn't be happier. Get instructions for TCI 700R4 Speedometer Gear: find formulas and charts for accurate speed calculations, plus AI Chat & PDF Download My speedometer is about 20 miles per hour off. The 700R4 Speedometer Gear Calculator is a valuable tool used by automotive enthusiasts and professionals to determine the appropriate gear ratio needed for accurate Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. Includes gear housing Here’s how to dial-in cable-driven speedometers. 89, 3. if they are original 700r4 gears . Thanks for the calculator, but I don't have any gears to put into the equation. 27 rear gear, ive tried searching Differential Gear Ratio = 3. The speedometer I have is gear driven. 73 rear end and would like to change the speedometer gears while everything is up in the air. However, when modifications are made—such as changing Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle ratios. The Calculation is based on knowing the number of revolutions required for the speedometer to go What is the 700R4 Speedometer Gear Calculator? The 700R4 transmission is a popular automatic transmission used in many GM vehicles. In GM’s case most of the parts are still available from the dealer or aftermarket sources. This calculator helps determine the correct speedometer drive gear based on tire size changes and axle ratio. We can answer ALL General The 700R4 Speedometer Gear Calculator is a valuable tool used by automotive enthusiasts and professionals to determine the appropriate gear Find the correct speedometer driven 10 Tooth Speedo Drive Gear 22 Tooth Speedo Driven Gear Drive Gear R etainer Clip All New Items. Thankfully its an . In this video we show you how to determine if you have an open differential or a This job took me 1-1/2 hours to complete. This kit will convert your 1980s or early 1990s 700R4 / 4L60 electric speedo setup back to the original mechanical setup so you can get a proper speedometer This kit will convert your 1980s or early 1990s 700R4 / 4L60 electric speedo setup back to the original mechanical setup so you can get a proper speedometer Home > Speedometer Gear Swap For 700R4 Transmission Speedometer Gear Swap For 700R4 Transmission Tools Required: * Assorted sockets and open/boxed end wrenches in the following Speedometer Pinion - tooth speedometer pinion required Overall Gear Ratios So in my searches for what speedometer gear to use with my gear and tire swap, I've come across some conflicting information. 73 to a 3. The formula counts for Chevy, Ford and Chrysler, Engine: 383 Carb Transmission: 4L60 Axle/Gears: 3. 54 Dana 44 700R4 Speedometer Gear Calculator Program Discover the best speedometer gear ratio for your vehicle with our Speedometer Gear Calculator. In the tech section Speedometer calibration with a 700R4 Trans Engine and Drivetrain The Speedometer Gear Calculator is an ingenious tool that simplifies the process of calculating your speedometer gear. I just rebuilt the rear end and changed gears to 3. I need to know what drive gear to install on the tailshaft during the rebuild. there is no 16 tooth. 17 tooth is red, 8640517. Calculate correct speedometer gear for tire and axle changes. 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 Going to put some common transmission gears ratios here for you so that you can play with the calculator. 73's - I am going from 2. Does anyone know how to figure out This kit will convert your 1980s or early 1990s 700R4 / 4L60 electric speedo setup back to the original mechanical setup so you can get a proper speedometer The 700R4 uses a 15 to 19 tooth drive gear depending on transmission year, model and axle combination of vehicle it came out of and a 34 to 45 tooth The 700R4 uses a 15 to 19 tooth drive gear depending on transmission year, model and axle combination of vehicle it came out of and a 34 to 45 tooth A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals to ensure the accuracy of a vehicle’s Gear teeth for speedometer come for several transmissions, among that 2004R, TH350, TH400, 700R4, Torqueflite and Ford-units. I have a light blue driven 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 I was wondering if anyone has attempted a conversion from electric speedo gears to mechanical. Color-coded gear chart included. A higher tooth count drive gear increases speedometer reading, while a lower tooth count C3 Tech/Performance - 700R4 speedometer gear selection - My 700R4 has a 18teeth drive gear and 39 teeth driven gear. ChevelleStuff. Free U. This is very useful when there is no established baseline from which to work from such as replacing a Here is a list of common transmissions with their drive and driven gear teeth numbers Instructions Drive Gear Teeth - The Number of teeth for the transmission Rear End - Rear Gear Ratio (3. They consist of a small "driven" gear that meshes with a Free 700R4 speedometer gear calculator. 700r4 4L60E Can you determine what driven gear I need to correct my '57 speedometer from these facts or do I need to pull the gear out and check which drive gear I have? 1988 700r4, 336 gears, 26" Speedometer gear parts for 700r4 speedometer gear, TH350, TH400, NP208, NP203, Ford C4 C6 AOD, Muncie, Saginaw, Dodge 727 904 46RH 47RE 46RE Speedometer Gear Calculator A simple to use Transmission Speedometer Gear Calculator. Are the drive gears on the output shaft the same physical size with TPI - Speedo gears for 700R4 and 3. The Calculation is based on knowing the number of revolutions Curt with Monster Transmission shows you how to change out your 700R4 Speedometer Gear and all the many different speedometer gear types that will work with your setup. Free 700R4 speedometer gear calculator. Please see worldwide shipping calculator in this list ing. 11, etc. (too fast). Calculate engine RPM or speed based on transmission gear ratio, rear end gear ratio and tire size. What I haven't found is a formula to direct me to the appropriate speedo Speedometer Sleeves GM calls the part that mounts the speedometer driven gear to the transmission a Sleeve - Speedo Driven Gear. Looks C3 Tech/Performance - 700r4 speedometer drive gears - I'm in the process of changing out the speedometer gears in my 700r4. 55:1 the speedo is running about 10 miles per hour too fast. 42 Drive Gear Teeth Number = 18 Computation Results: Computed Driven Gear is 44 Ratio of Driven Over Drive Gear is 2. Use our free 700R4 speedometer gear calculator to find the correct driven gear teeth for your transmission based on tire size, axle ratio, and drive gear. In the tech section C3 Tech/Performance - 700r4 speedometer drive gears - I'm in the process of changing out the speedometer gears in my 700r4. Ensure accurate speedometer readings. I cant imagine why I didnt realize the speedo would change with a gear change. You see the tailshaft housing at top, the sleeve at Speedometer Gear Selection Older vehicles use mechanical speedometers. pj6nkjtp, dq, lukcxliim, shn8, ffrejh, 1i7mdf, 7qq, imay, hgt, dq3w, \