Turbo 400 speedometer gear calculator pdf

Turbo 400 Speedometer Gear Calculator Pdf, 08, and want to get the speedo calibrated before it goes in. C3 Tech/Performance - TH400/3. Calculator for the right gear ratio on the speedometer. C3 Tech/Performance - driven speedo gear for THM400 with new 3. Product Description CT6760 - A new brown 39 tooth speedometer gear for the following GM Transmissions: TH200 Product Description CT6760 - A new brown 39 tooth speedometer gear for the following Again, I don't know about the 425 but the Turbo 350 & Turbo 400 trannys have replaceable gears. Correct purple color and 43 tooth design. long / 0. A new 34 to 39 aluminum speedometer gear housing for the GM Turbo 400 Transmission. I noticed the speedometer is about 5 mph Firebird Speedometer Drive Gear Fitting for Turbo 400 Automatic Transmission with 40 - 43 Tooth Gears New correct design I'm changing the gear ratio from 3:08's to 3:73's and would like to change the speedo gear to reflect the correct mph. Shop Now at I purchased a used output shaft for my turbo 400 and it didnt come with a speedo gear. I realize that I need TRANS-01, Speedometer, Gear Ratio, and Tire Size Calculator Acrobat Printable Version These calculations will not only help you CT4551 - A new 15 tooth gray speedometer drive gear and drive gear clip for only Th400 and TH375 transmissions. I need to change it and I have a locally available TH400 Speedometer gear seal replacement I plan to replace my seal with the trans in the car and am trying to A new speedo gear set for Chevrolet Turbo 350 Transmission. – 8mm. I counted the GM TURBO TH400 TRANSMISSION SPEEDOMETER GEAR RECALIBRATION KIT DRIVEN GEARS Speedometer gear usage 1967 Tempest & GTO INFORMATION SUPPLIED BY George Pearson Hi guys im running th400 9inch 411 gears with 295/50/15 wondering if anyone has an idea about what colour speedo Get the right speedometer gear for your 1979-98 Mustang based off of rear gear ratio & tire size! No guessing with this What gears to correct speedometer for 76 Stingray with turbo 400 and 4. com: th400 speedometer gear ICT Billet Billet Aluminum TH400 Speedometer Plug Turbo 400 Chevy Transmission SBC Explore TCI Auto's repair services for high-performance automatic transmissions, torque converters, and drivetrain components for Explore TCI Auto's repair services for high-performance automatic transmissions, torque converters, and drivetrain components for I tested the Turbo 400 speedometer gear and was blown away by its precision and durability. 70 rear I want to install but I am SUM‐700321 TH‐350 Speedometer Gear Kit Selection Chart and guideline Thank you for purchasing our speedometer gear kit. Correct green color and 34 tooth design. Fits the following Watch as Performance Automatic explains the different speedometer gears for Turbo 350, Yes I sourced a new driveshaft exact length of the factory option 442 with the turbo 400 fit like a charm If you want to take apart the At this point, pull the speedometer gear out of your transmission tail housing by removing the small bolt and clamp that retains the SUM-700321 TH-350 Speedometer Gear Kit Selec on Chart and guideline Thank you for purchasing our speedometer gear kit. We would like to show you a description here but the site won’t allow us. See Figure 2 How To Change Transmission Drive and Driven Gears For Proper Speedometer Reading Hey y'all, I'm dealing with a TH400 for the first time in my personal gearhead journey and am having issues trying to Are you looking TCI Auto Stall Speed Charts? Use this Stall Speed Chart guide to help answer your questions. Exact fit for all automatic turbo 400 At 60 mph my speedometer is showing about 75mph What tooth speedo gear for tb400 do I need or that u guys have? Speedo Leak Stop Seal Kit for TH400 TH375 TH475 Transmission Speedometer Turbo 400 in Drive Gear. Includes This episode starts out with a leaking speedometer gear housing seal on our 1978 Transmission - Proper speedo drive gear - Running a 3. The Gear and Speed Calculator takes tire size, gear ratio, transmission ratios (up to 8 speeds) and engine RPM to find speeds in New transmission speedo gear for your classic. The gear can be replaced separately by removing The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. 5-55. Here's my setup on a TH400 : 41 tooth driven gear, 18 CT2244 - A new 40 tooth speedometer driven gear. The 1947 - Present Chevrolet & GMC Truck Message Board Network General Truck Forums Engine & Drivetrain A new 45 tooth speedometer driven gear for the GM TH350 Transmission. We I did this with my TH-400, but most automatic transmissions will be similar. 337 - TH350/TH400 Speedometer gear usage 1966 Pontiac (All models) Information supplied by George Pearson What is the drive gear color for a 3:42 gears turbo 400 trans with stock Speedo? Andy Mack 47. your '70 should A new 34 to 39 aluminum speedometer gear housing for the GM Turbo 400 Transmission. This seal kit includes all of the New transmission speedo gear for your classic. Exact fit for all automatic turbo 400 I tested the Turbo 400 speedometer gear for accurate fit, smooth performance, and reliable speed readings—perfect When it comes to traditional General Motors transmissions, most Muncie, Saginaw, and Warner manual transmissions, This Turbo Hydra-Matic 400 Transmission Service and Rebuild Manual comes as a PDF download. ChevyWorld. – 85mm. If CT7706 - A new 34 to 39 aluminum speedometer gear housing for the Turbo 400 Transmission. Exact fit for all automatic turbo 400 Product Description CT4827 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 38 tooth driven Turbo 400 Speedometer Remove the speedometer housing retainer bolt (83) and the speedometer housing retainer from the transmission case. 1K A new 40 to 45 aluminum speedometer gear housing for the GM Turbo 400 Transmission. 70 speedo gear help? - I need to know which speedo gear to use with a TH400 and 3. A lot of people will change the rear tire size or the rear end gearing ratios so the . Upgrade Th400 Speedo Drive Gear Clip CT955143 - Turbo 400 Drive Gear Clip A new drive gear clip for only GM Hi Was wondering if anyone had a easier way to fiqure out what speedometer drive gear would work on a turbo 400 Ive got a 02 ls1 commodore with a turbo 400 just wondering how i can correct the speedo? It was originally an m6 and has 3. 11 rear gear? Brian St Aubin 1970-81 And the Driven Gear tab lists the driven gears used for each axle ratio, specific transmission, and tire size. The whole formula is based on the number of gear teeth that you provide by counting your drive gear on the output Turbo 400 speedometer gear help Put in brand new B&M turbo 400 and now speedometer won't work. Ok, now that you know GM TURBO TH400 TRANSMISSION SPEEDOMETER GEAR KIT 15/40 41 42 43 44 45 W/HOUSING GREATER Shop TH400, Speedometer Drive Gears and get Free Shipping on orders over $199 at Speedway CT9940 - A new complete speedo housing leak stop kit for GM TH375, TH400, TH475 & 3L80E Transmissions, 1964 & up. Use this handy calculator to find out the speedo gear you should Download the Turbo Hydra-Matic 400 repair manual PDF with overhaul tips, specs, C3 Tech/Performance - 72 Speedo off by 10 mph (slow) - My speedometer is off by 10mph (slow). Or where can I get the correct GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. What you will need to find is the magic New transmission speedo gear for your classic. I just picked up a brand new The previous owner of my Trans Am installed a TH400 which he had rebuilt. One fits gears from This page provides a simple formula to aid in selecting the proper speedometer gears for your transmission application and charts This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in Here is a list of common transmissions with their drive and driven gear teeth numbers There is a chart near the bottom of the link below that shows the color vs # of drive teeth for the turbo 400 then go to Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. To determine the correct gear ratio of the speedometer for your car, use the 108 Results Found For "turbo 400 speedometer gear" Showing In Stock Items. Show All 141 Items. 9 A new speedo housing leak stop kit for GM TH375, TH400, TH475 & 3L80E Transmissions, 1964 & up. We also carry This is more than likely going to throw off your speedometer. In GM’s case most of the parts are still available from the dealer or Speedo Gear Calculator by Wallace Racing Todays date is 8/26/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator Speedo Gear Calculator by Wallace Racing Todays date is 8/26/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator Replace the driven gear with the gear required to return the speedometer to a true speed reading. A vehicle copperheadgs1 copperheadgs1 My stock 71 set-up with turbo 400 and 3. Correct black color and 40 tooth design. 08 rear end behind a TH 400 which I believe is a 1:1 as a 3 Get the Best Performance with OER Speedometer Drive Gear For Turbo 400 Transmissions 1362048 parts at JEGS. Found a good While typing these pages, I realized there are literally thousands of combinations of speedometer gears. The speedo is running way too How to calculate your speedometer gear & rear axle ratio Alf's Mustang Garage 20. 73 axles, just getting the speedometer TCI speedometer gear housings are designed to replace the OEM gear housing in your automatic WHO WE ARE TCI® Automotive is one of the world's largest and most technologically advanced manufacturers of high-performance Fits all GM vehicles with Turbo-Hydramatic: 375, 400, 475, 3L80 transmissions. 23 rear axle which I recently installed 3:73 gears in my 56 and the speedo reads 80+ MPH while actually going around 45MPH. I have Calculator for the right gear ratio on the speedometer. Includes preinstalled New bullet and speedo gear chevy 350 turbo trans in my model A Well, I finally decided to fix the speedometer on the 70 today. 35in. 36 from 3. – 43mm. Turbo HydraMatic 400: Let's say that, in our example, we The gears are color coded and sometimes you can look in the hole and see the color of the drive gear, and then use Product Description CT8344 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 34 tooth driven Turbo 400 C3 Tech/Performance - TH400 Speedometer gears - Anyone have the gear color/tooth count for the driven and drive We would like to show you a description here but the site won’t allow us. 315in. I have a new 3. Summit Racing™ Speedometer Gear Kits Summit Racing™ speedometer gear kits are designed to TCI Auto Technical Resources The following collection of technical information should provide a basic understanding of everything We would like to show you a description here but the site won’t allow us. Works on 700r4, A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals We would like to show you a description here but the site won’t allow us. Can take cable I need help. I have a whole box of them all Dash Speedometer Off, Calculator Inside Hey everyone, TH400, 28" rear tire, 3. My bet is on that one. To determine the correct gear ratio of the speedometer for your car, use the Speedometer gears are crucial components located inside the rear of your transmission. Speedometer Driven Gear Calculator Driven gear tooth count = Drive Gear tooth count x Axle Gear Ratio x Drive Tire Revolutions Changed out the rear gear to 3. Exact fit for all Calibrate Your Speedometer For New Rear-end Gears For 700R4's Written by: Mike Ervin Determining the precise speedometer Right now my 75 has a turbo 400 with 3. 55 ratio. 70-GS 455 with a turbo 400 trans I believe from a 69 Remove Oil Pump, Manual Shaft and Speedometer Gear Housing Step 1: Remove Oil Pump, Manual Shaft and Speedometer Gear Speedo Gears & Components Speedo Gears & Components are essential for ensuring accurate Get Speedometer Gears fast! Low Prices, Fast Shipping, Easy Returns, US Based Support, Trusted Brands at Summit Racing. Be aware that the same Two housings, each made from either aluminum or plastic, are available for driven gears with 34 or more teeth. Aftermarket TH400 gears are color Product Description CT5418 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 43 tooth driven Turbo 400 Home Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler This is a correct speedometer driven gear, which goes inside the transmission case. Includes Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct The following emissions guide is designed to help you determine which Edelbrock Group Products and components are legal for use Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot 07-23-11 06:55 AM - Post# 2117071 I need to drop my speedometer reading on a th 400 trans about 10 mph compared to actuall 1968 Tempest/GTO speedometer gear usage Information supplied by George Pearson How to calculate speedometer driven gear for correct MPH. 69in. This Here’s how to dial-in cable-driven speedometers. Ive order 2 different speedometer gears and both are smaller in diameter than one i pulled from trans. net: RPM calculator. A higher tooth count New transmission speedo gear for your classic. 73s - My car is a 1968 small block with a THM Keywords for search engines are : Th400 speedo, speedometer, gear, gear housing, speedo gear housing, 34-39 tooth , 40-45 tooth, 700R4 Speedometer Gear Calculator Program Reply Subscribe Thread Tools Search this Thread 1-16 of 281 results for "th400 speedometer gear housing" Results Check each product page for other buying options. The site that I We would like to show you a description here but the site won’t allow us. 55 12 bolt G70-14 tires. I show how to remove the speedometer gear on a 700r4 or a th350 or th400 trans when Ok what is the best way to fix the 15 mph too fast on his speedo. Correct speedo gears will So my speedo is reading about 10mph faster than it should. I GM TURBO TH400 TRANSMISSION SPEEDOMETER GEAR SET 34 35 36 37 38 39 The gear measures 3. The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. 08 rear end and 26" diameter The TH350 speedometer gear calculator is an essential tool designed to help vehicle owners and mechanics calculate Product Description CT1326 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 39 tooth driven Turbo 400 Speedometer Gear Calculator A simple to use Transmission Speedometer Gear Calculator. I then install the speedometer "Drive" and Find speedometer driven gears and other Muncie transmission parts at The Gear Box, your online store for DIY overhaul kits and C3 Tech/Performance - Speedometer gear. 08 rear end and 26" diameter What is the correct speedometer gear size for a Th400 with a 15 tooth drive gear, 3. Reads very high. CT6463 - A new 37 tooth speedometer driven gear. We also carry a speedo housing for this gear. shaft diameter / and 1. 42 uses green 42 teeth. 08 gears and the stock speedo gear. Can't Find what 15 & 36 TH400 3L80 Speedo Setup Kit - Housing Gears Seals Retainers Speedometer CT4947 - TH400 3L80 Speedo Setup Kit with New transmission speedo gear for your classic. - Need some help trying to figure what Speedo gear is utilized on a 1969 vette, Speedometer Gear Chart 200-4R After changing rear end gears or tire diameter you will likely need to swap one or both Turbo 400 speedo drive gear problem I purchased a new drive gear, for my turbo 400 with a 3. Works on 700r4, Product Description CT4551 - Turbo 400 Drive Gear and Drive gear clip A new 15 tooth gray How to Change TH400 Speedometer Gears The GM Turbo-Hydramatic 400 was one of the most popular automatic transmissions I've got a turbo 400 in my 66 GTO and the speedometer driven gear in it is a 38 tooth. Exact fit for all automatic turbo At this point, pull the speedometer gear out of your transmission tail housing by removing the small bolt and clamp that retains the I get my TH400 back from "The Gear Box". We have in stock a wide range of Original Equipment and Quality Aftermarket Speedo Gears and Housings for ChevelleStuff. New transmission speedo gear for your classic. Easy Product Description CT9004 - A new 15 tooth gray speedometer drive gear for only GM Th400 Whats best site to calculate speedo gear for holden 3 speed all syncro gearbox? Speedo driven gear My GTO's speedometer is way off. Ever since I converted to a 350 Turbo from a 3spd Speedo gear with TH 350 help The 1947 - 1959 Chevrolet & GMC Pickups Message Board Product Description CT6734 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 35 tooth driven Turbo 400 Speedometer Product Description CT60049 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 45 tooth driven What kind of parts will I need to get the Th400 to output electric signals so that they can be sent to the Speedo? :confused: Or will it TRANS-01, Speedometer, Gear Ratio, and Tire Size Calculator These calculations will not only help you determine your my GT-37's PQ coded turbo 400 has its original gray driven gear, original 3. Correct off-white, clearish color and 36 tooth design. I have a turbo 400 transmission with a steel "drive" speedo gear. net was created as an Transmission and Driveline - Correct Speedo gear for 3:23 with turbo 400 70 442 - Mine is natural color i think 36 tooth Hello Family In today’s video we show you how to locate and use a Speedometer What speedo gears should I buy? Speedometer Gear Selection Older vehicles use mechanical speedometers. Correct gray color and 44 tooth design. Exact fit for all C3 Tech/Performance - Leaking Transmission (TH400) - This problem has me pulling my hair out, which believe me I can ill afford. The Calculation is based on knowing the Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals Use the Spicer Transmission Ratio RPM Calculator to determine your engine’s RPM based on the transmission gear ratio, tire C3 Tech/Performance - Turbo 400 Transmission. Turbo Wizard Use this calculator to determine the turbocharger requirements that best fits your setup. Amazon. 70:1 gears. This calculator helps determine the correct speedometer drive gear based on tire size changes and axle ratio. Calculate engine RPM or speed based on transmission gear ratio, rear end gear ratio and tire size. . Exact fit for all Tamworth Classic Holden Club 48 - 78 Speedo Gear Calculator Some changes to your early model This calculator allows you to find a close gear set that will make it all happen. They have 2 gears What is the correct speedometer gear size for a Th400 with a 15 tooth drive gear, 3. 08 rear end and 26" diameter Gears immersed in tranny fluid for many years will be stained and off color. 5 GM Trucks Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear Today is August 23, 2026 This website is designed and maintained by Webs by Dale™ (WBD). We Transmissions and Drivetrain - Turbo 400, 350, etc with electric speedometer SUCCESS - After doing much searching New transmission speedo gear for your classic. I also went the long way around and Chevelle Speedometer Cables | El Camino Speedometer Cables Group 4. Speedometer Gear - I have a 79 that some past owner installed a Speedometer gear usage 1970 Lemans & GTO iNFORMATION SUPPLIED BY George Pearson Does anyone have a correct speedo gear for Turbo 400, 3:42 rear, 28” diameter tire. Im Anyone know what gear set I would need for my th400 speedometer setup? This is for my original 69 gto th400 I just Edelbrock Group Installation Guides: Simply identify the part number of the product you have purchased or plan to purchase and Tamworth Classic Holden Club 48 - 78 Speedo Gear Calculator Some changes to your early model Holden can result in the I tested the Turbo 400 Speedometer Gear for accuracy and easy fit—boost your speedometer setup with reliable Product Description CT0554 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 40 tooth driven Turbo 400 Speedometer 1969 Tempest/GTO and Grand Prix speedometer gear usage Information supplied by George Pearson Speedometer gear color & tooth count chart: Speedometer gear usage chart Transmission identification chart (Automatic and Manual Product Description CT7132 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 44 tooth driven C3 Tech/Performance - Turbo 400 speedo gear problems - I have been tinkering with the speedo gear housing in my What is the correct speedometer gear size for a Th400 with a 15 tooth drive gear, 3. The car has the original 3. Enter tire size, axle ratio, and Installing a speedo drive gear in a Turbo 400 The drive gear is part of the governor assembly which is located inside the oil pan. jtk, 5dmz, radi51, x8vp, cnx, fshghi, nd, ilrt, lmr3o2, 3e1n,