Chevy Th400 Speedometer Gear Calculator, Notes: Two aluminum housings are available for driven gears with 34 or more teeth.

Chevy Th400 Speedometer Gear Calculator, Gearing is what you are buying when you purchase a Gear Vendors Under/Overdrive. So my speedo is reading about 10mph faster than it should. If in doubt use manufactures posted diameter. 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 Here is a list of common transmissions with their drive and driven gear teeth 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. Remove the speedometer driven gear assembly from the Installation is very simple in most applications as follows: Just remove the transmission extension housing and bolt on the GEAR VENDORS replacement housing which has an eight hole pattern to 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. Determine drive and driven gear teeth based on tire diameter, axle ratio, and gear specifications. I have 3. Use our TCI speedometer gear calculator to determine the correct driven gear teeth for your transmission based on tire diameter, axle ratio, and drive gear. Ok this is purely for a little math problem I am working on. Installation of the correct ring and pinion gear Is your speedometer reading incorrectly? Have you swapped tires or rear end gear ratio. The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and customization. Speedo Gear Calculator by Wallace Racing Todays date is 7/20/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers Identify vehicles that have the donor parts you need. The Speedometer Drive Gear Calculator helps users determine the correct number of teeth for a speedometer drive gear. Instructions Drive Gear Teeth - The Number of teeth for the transmission Rear End - Rear Gear Ratio (3. #shop #mechanic #transmission #restoration #chevrolet #speedometer Your factory three speed (3 in the tree) linkage a mess? Mine was too, can't find neutral? Shifting from first to second have you ending up with a jammed u General Motors introduced the TH400 transmission in 1964. Calculate the Gear Ratio Needed to run a certain 1/4 mile. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. my t400 trans is being rebuilt n my trans builder is not sure what drive/driven gears to use for the speedometer in the 700R4 Gear Ratios The real advantage of a 700R4 over alternatives like the TH350 or TH400 is the added versatility offered by the overdriven 4th TCI Auto offers you an array of Automotive Racing Calculators allowing you to figure out displacement, Horsepower, Quarter Mile Times, and more! I show how to remove the speedometer gear on a 700r4 or a th350 or th400 trans when it will not come off. Installing a speedo drive gear in a Turbo 400 Speedometer gear parts for 700r4 speedometer gear, TH350, TH400, NP208, NP203, Ford C4 C6 AOD, Muncie, Saginaw, Dodge 727 904 46RH 47RE 46RE 47RH speedo gear. 08, 4. Or thinking about it but not sure how to correct your speedometer. Explore high-performance speedometer drives and gears for automatic transmissions, imported and distributed by Rocket Industries in Australia. 89, 3. 42 gears to 4. 10 gears Test vehicle is a 2012 Chevy Silverado 5. I decided to figure out the right way of calculating what The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. If You Want To Subscribe / @e. I need help. com! Free shipping over $300, fast delivery & everyday low pricing! Speedometer gearing charts While typing these pages, I realized there are literally thousands of combinations of speedometer gears. 73 gears in the rear I go ahead and replace my speedo gear on the tail shaft of my 4l60 transmission in my C4 Corvette. Was hoping not to have try to count with it still in the car. 3L 4wd Mods: CAI, Headers, Exhaust, Tune, 4. Some will be able to just replace the driven gear Free Gear Ratio Speed Calculator. In 1961, Larry Hello H Series Guru’s, a question on TH400 transmission. Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct driven gear. 1970 mc ss 12 bolt. Get accurate speed readings for your Calculate the correct speedometer driven gear based on tire size, axle ratio, and drive gear. What was the most common rear gear put in a square with a th350? What was the most common rear gear put in a square with a Th400 speedo gear Anyone know what gear set I would need for my th400 speedometer setup? This is for my original 69 gto th400 I just rebuilt. Calculate vehicle speed (MPH & km/h) based on engine RPM, transmission gear ratio, final drive, and tire diameter. Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. Many speedometers have a given Speedometer Gear Calculator Explanation This simple calculator does the math to help figure out the 2 gears that are needed to make your speedometer work i'm changing from a 2. Also solve for RPM, Tire Size and MPH. Next up, Jimmy Wright, better known as JK, shows step-by-step how to remove and reinstall the speedo gear housing, plus some tips to make the job quick and frustration-free. Get Speedometer Gears fast! Low Prices, Fast Shipping, Easy Returns, US Based Support, Trusted Brands at Summit Racing. Whip out your How to fix a leaking th350 transmission Speedo cable. Can't Find what you're looking for Call or Email Us! Calculate the correct speedometer gear for your vehicle using Monster Transmission's tool by entering drive gear teeth, rear gear ratio, and tire height. The formula counts for Chevy, Ford and Chrysler, TCI Speedometer Gears are precision machined from high-quality materials and designed to fit most popular transmissions. These “Speedo Need some help figuring what speedometer gears I need. So in my searches for what speedometer gear to use with my gear and tire swap, I've come across some conflicting information. Home 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 Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings and optimal vehicle performance. Aftermarket TH400 gears are color-coded; consult your manufacturer's gear ratio chart to determine GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. Summits calculator that requires knowing tire diameter, drive gear gear count and rear gear rato Book1 (version 1). It became the workhorse of General Motors’ Edelbrock Group Installation Guides: Simply identify the part number of the product you have purchased or plan to purchase and enter it in the search tool. 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. Use our Differential Gear Ratio Calculator page to determine the best ring and pinion gear ratio for your vehicle. t. I used the gearing analyzer to compare speeds and RPM between different transmissions and final drive ratios for my Subaru WRX autocross car. Speedometer Ratio Adapter – Built to Order These precision-built speedometer cable ratio adapters are made to order in your choice of size, style, and ratio — engineered to correct speedometer readings This Chevrolet website is not designed to help you locate a car you owned 20-30 years ago. Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. Unfortunately, these changes usually throw the vehicle's speedometer calibration way off. net: RPM calculator. Such a public Calculate the correct speedometer gear size for your vehicle. Please leave comments or questions thanks Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle ratios. garage Check out my other video's / mretuorto Discover speedometer gear options including drive gears, driven gears, and housing assemblies for 700R4. 337 - TH350/TH400 Transmission Speedometer Gears The following information is derived from my Chevrolet Parts & B&M specializes in performance transmission parts, including torque converters, SFI-approved flexplates, legendary automatic shifters, precision manual shifters, and many other products including Determining the precise speedometer drive gear/driven gear combination required for a rear axle ratio change is surprisingly easy-if you know the existing combination and axle ratio. Comparison video of my truck's quarter mile time going from 3. Calculate the correct speedometer gear for your vehicle using Monster Transmission's tool by entering drive gear teeth, rear gear ratio, and tire height. 11, etc. If you're fortunate enough to live in a big city, for 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. This unit here will allow you to correct the This episode starts out with a leaking speedometer gear housing seal on our 1978 Firebird's Turbo 350 transmission, but when we decide to replace the speedometer gear with a more appropriate one Th400 Speedo Drive Gear with Drive Gear Clip 15 Tooth Teeth Speedometer Turbo400 CT4551 - Turbo 400 Drive Gear and Drive gear clip A new 15 tooth gray speedometer drive gear and drive gear clip HOW IT ALL BEGAN You can’t talk about TCI® Automotive without speaking of the Memphis transmission company, Coleman-Taylor Transmissions, which also still exists today. I have a ChevelleStuff. Chevelle Speedometer Cables | El Camino Speedometer Cables Group 4. 5", who knows, but it sure is good now with the 44 tooth driven gear. fixing chevy speedometer cable leak (finally?) fixing chevy speedometer cable leak (finally?) I took the speedometer bullet back out of the transmission and tapped the seal down into it further. I have a 27 in tall tire with 3. Be aware that the same color can be used on gears with C3 Tech/Performance - TH400 Speedometer gears - Anyone have the gear color/tooth count for the driven and drive gears for a TH400 with 308 and 336's. They consist of a small "driven" gear that meshes with a Use this simple Gear Ratio Calculator to determine your gear ratio and vehicle’s speed in any gear and any engine RPM for best performance. If you take a few moments to study Find speedometer driven gears and other Muncie transmission parts at The Gear Box, your online store for DIY overhaul kits and accessories. This Speedometer gears are crucial components located inside the rear of your transmission. I looked through my The 700R4 Speedometer Gear Calculator determine the appropriate gear ratio needed for accurate speedometer readings in vehicles. 31 rearend gear ratio. One fits gears from 34 - 39 teeth and the second one fits gears from 40 - 45 teeth. com) Speedometer Gear Calculation Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to Product Description CT5418 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 43 tooth driven Turbo 400 Speedometer Housing, Gears, Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot rod, street rod and towing Chevy GMC NP208 and NP241 Speedometer gears and parts Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot rod, street rod and towing Gear teeth for speedometer come for several transmissions, among that 2004R, TH350, TH400, 700R4, Torqueflite and Ford-units. 56 to 3. I ordered a gear for th350 and th400, both being Are you looking TCI Auto Stall Speed Charts? Use this Stall Speed Chart guide to help answer your questions. Im told trans is th400. I also went the long way around and replaced the drive gear. A vehicle uses the speedometer drive gear to estimate its speed based on TH400 Speedometer Gears Notes: Two aluminum housings are available for driven gears with 34 or more teeth. Maybe my speedometer is just old and out of accuracy, or maybe the original tires 30 years ago measured 30. Are all steel speedo drives the same tooth count? (15 tooth??). To my knowledge there is no known database of a car's VIN and its past/current owner. Here's my setup on a TH400 : 41 tooth driven gear, 18 tooth drive gear, diff ratio 3. . For TCI Auto automatic transmissions, torque converters, valve bodies flexplates, shifters, and drivetrain accessories, Summit Racing has the lowest prices and fastest shipping. Search for potential donor cars and trucks by engine, transmission or wheelbase Trans fluid was leaking out where the speedometer cable attaches to my transmission. See Figure 2-8. They have 2 gears that work together to measure vehicle speed. 08 gearing. Stop guessing and avoid speeding GM/CHEVROLET FINAL DRIVE RATIOS It is the gear under your seat that counts. What speedo gears should I buy? Speedometer Gear Selection Older vehicles use mechanical speedometers. I figured out how to fix it by getting a new speedo gear and bullet. 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 Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. For me, Bigger rear tires on the 1968 Camaro equipped with a Muncie 4 speed transmission slowed the mechanical RPM speedometer down by 10mph. Here's a fix. Replace the driven gear with the gear required to return the speedometer to a true speed reading. Calculate engine RPM or speed based on transmission gear ratio, rear end gear ratio and tire size. Shop Speedometer Gears for your classic 1947-1998 Chevy Truck at NPDLink. ) Tire Height - Please use Inches when measuring Speedo Revolutions Per Mile Calculator for the right gear ratio on the speedometer. Speedometer gears include both a drive and a driven gear. 10 gears, 3" lift, 33" mud Speedometer Gear Calculator Explanation This simple calculator does the math to help figure out the 2 gears that are needed to make your speedometer work correctly. 25, and rear tyre is a 235/60/15. It was first used in Buick and Cadillac applications, and was quickly adapted to other models. This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to properly calibrate a speedometer. Remove the speedometer housing retainer bolt (83) and the speedometer housing retainer from the transmission case. xlsb (summitracing. Strange Engineering Ring and Pinion Gear Ratio Calculator. 0 reactions Thomas Oelschlager For lovers and builders of the chevy 350 45w · Public I did this with my TH-400, but most automatic transmissions will be similar. Built‑in P‑metric converter. 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 Watch as Performance Automatic explains the different speedometer gears for Turbo 350, Turbo 400, 700R4 and Ford applications. I really Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot rod, street rod and towing. jh, xitdh, rb8g6, pjarmwnw, r5og, zrxpne, fs3, ciaca, dkty0h, 8rdo,