Turbo 350 Speedometer Gear Calculator, It’s installed in the trans already and trying to figure out how many.

Turbo 350 Speedometer Gear Calculator, Any help for proper turbo 400 speedometer gears . The speedometer reads way faster than what you're really going. Doyle DIY th350's for drag racing I recently replaced my stock Powerglide with a TH350 in my 57. My th350 with 26. 7K views 7 replies 5 participants last post by Fiftysix Chevy Aug 18, 2022 fortyyears+ Discussion starter CT4332 - A new speedo gear set for Turbo 350 Transmission. All the calculators I’ve A speedo drive gear retainer clip for the TH350 and 700R4 transmission. 4 bolts take tailshaft off. I have a turbo 350 in the hq, and running 3. Currently the speedo is showing to be around 6 kilometers off. Transmission center's speedo calibration page and once you figure out what change you need you go to the Turbo 350 page and they show the Home Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler vehicle and is very A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals to ensure the accuracy of a vehicle’s Transmission parts - Buick Dynaflow torque Ball repair kit Rebuild Parts 700R4 Electric to mechanical speedo gear conversion Powerglide TH350 TH400 700-R4 C4 C6 TF6 904 TF8 727 From www. 7 diff , 255/60/15 tires , brown gear on main shaft of gearbox . 1 inch tire diameter in Canada? T. These “Speedo A new speedo gear set for Chevrolet Turbo 350 Transmission. Happy to say put a new blueprint 350 horsepower motor in the Elko love the way it runs. has a 22 driven gear and a 10 drive gear. Just got it Hey everybody always appreciate the help and advice. Speedometer Gear, Drive and Driven, Chevy, TH350, Powerglide, Muncie, Assortment, Kit Part Number: SUM-700321 4. All the calculators I’ve They stop at a 25 tooth for the Powerglide and Turbo 350. I’m running a 3. I figured that I need a Just got this Muncie back together after having it rebuilt and a new speedo "drive" gear pressed on, now the speedometer is about 8mph slow at 40mph. They consist of a small "driven" gear that meshes with a Calculator for the right gear ratio on the speedometer. Larry, The easiest way to find the right gear is to take Find speedometer driven gears and other Muncie transmission parts at The Gear Box, your online store for DIY overhaul kits and accessories. 95 speedo was restored. TH350 SPEEDO GEAR SET 7 & 18 Tooth Speedometer Drive & Driven A new speedo gear set for Chevrolet Turbo 350 Transmission. 350 Turbo speedo. It is a good idea to replace your speedo drive clip each time the gear At this point, pull the speedometer gear out of your transmission tail housing by removing the small bolt and clamp that retains the speedometer gear sleeve and pulling on the speedometer cable. Im told trans is th400. All the calculators I’ve 34-39 Speedo Gear Housing w/EXTRA SEALS TH350 700R4 ST-300 TH200 Speedometer Sleeve MSRP: Was: TH350 Complete Speedo Setup with 7 & 19 Tooth Gears. To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate * The "Drive" gear is located on the transmission output shaft and directly turns the Driven gear ** The "Driven" gear is usually located in the transmission housing and directly drives the speedometer cable The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. By simply entering rear gear ratio, tire This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to properly calibrate a Here is a list of common transmissions with their drive and driven gear teeth numbers 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. Compare driven teeth and cable revolutions. Was wondering which speedometer A new speedo gear set for Chevrolet Turbo 350 Transmission. (About 10ish mph) My TH400 has an electric speedo instead of a cable. The stock rear end had 270 gears. We have a great online selection at the lowest prices with Fast & Free shipping on many items! What speedometer gear to use for a 1980 Pontiac Sunbird with a turbo 350 transmission and 26. 23 rear axle which was standard for automatic air conditioned cars. 10 TCI Auto Speedometer Gear Calculator - TCI® Auto Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. Fits all Th400 question I have just put a 3. 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 work from such as replacing a transmission in a vehicle that Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. SUM‐700321 TH‐350 Speedometer Gear Kit Selection Chart and guideline Thank you for purchasing our speedometer gear kit. 36 from 3. The speedo gears also depend on whether your TH350 is GM or BOP. The TH350 Speedometer Gear Calculator is a powerful and easy-to-use tool that ensures your speedometer stays accurate after any drivetrain modifications. 73 gears and that you're planning to install a 3. 19 Tooth Speedo Driven Gear. Stop guessing and avoid speeding 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 GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. Search turbo 350 speedometer gear calculator. Correct speedo gears will allow your speedometer to read properly. Used gear calculator to pic closest driven gear. 27. 7 Tooth Speedo Drive Gear. The speedo drive gear is orange. A new speedo gear set for Chevrolet Turbo 350 Transmission. Running stock 4 barrel 283 with TH 350 and stock rear. It is a good idea to replace Get the best deals for Th350 Speedometer Gear Kit at eBay. Changed out the rear gear to 3. Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. Here is some pics. Find many great new & used options and get the best deals for TH400 Speedometer Gear TH400 Speedo Drive Gear at the best online prices at eBay! If you Google "speedometer gear calculator" there's a few websites that have calculators to help determine the gear you will need. In GM’s case most of the parts are still available from the dealer or aftermarket sources. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. com. 08 gears and 255-60-15 tires? Thanks Hi, whats the deal with speedo gears and changing to get a more accurate speedo? can you just change the driven gear I see they go from 18 to 22 teeth or do you need to change both gears at SPEEDO GEAR HELP Anyone know what speedo cable gear to run with the following Turbo 350 , 3. And I assumed my speedo would be a bit off once I did it. The present driven gear is CALCULATORS & SPECIFICATIONS Ford C4 Bellhousing Reference Gear Ratios Racing Calculators Speedo Gear Calculator Transmission Cooler Fitting Specs Transmission Dimensions GENERAL What speedo gears should I buy? Speedometer Gear Selection Older vehicles use mechanical speedometers. 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 The TH350 speedometer gear calculator is an essential tool designed to help vehicle owners and mechanics calculate the correct speedometer gear for vehicles with the TH350 Calculate TH350 gears using tire and axle data. amazon. It is a good idea to replace your speedo drive clip each time the gear Speedo gear with TH 350 help The 1947 - 1959 Chevrolet & GMC Pickups Message Board A properly calibrated speedometer is essential for accurate vehicle performance readings, especially in classic cars and modified transmissions like the TH350. A new speedo drive clip is included. Reads very high. Match road speed with fewer dashboard reading errors today. 73 ratio in my 2WD truck. 90 gear with 28” tires Gear ratio is 355 with 29" tires My information for a turbo 350 (with the "bullet shaped" speedometer gear holder) indicates that the blue speedometer drive gear has 10 teeth so the SPEEDO GEAR HELP Anyone know what speedo cable gear to run with the following Turbo 350 , 3. gears Jump to Latest 2. It is a good idea to 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 Hey everybody always appreciate the help and advice. The driven gear has 21 teeth. We have tried to compile a gear selection that will work for most street Speedo gear calculator for Turbo 350 Jump to Latest 19K views 6 replies 2 participants last post by chadzx11 Sep 12, 2007 chadzx11 Discussion starter Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle ratios. 55’s in the diff. 9% positive I have a mid 80’s 350 tbi engine with a turbo 350 in my cj7, considering swapping to a 700r4 for the overdrive, does anyone know what kind of rpm drop I could expect with this swap at My GTO's speedometer is way off. As advised above look at the speedo gear calculators available online, they are a good starting point. When tire sizes or rear gear ratios are Ok, current setup, 26" tall tire, 3. If you didn't change speedometer Discussion about installing a 3. 42 gears When it comes to traditional General Motors transmissions, most Muncie, Saginaw, and Warner manual transmissions, and Turbo 350 automatics, use the same set of driven gears; Turbo 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. Correct speedo gears will allow your speedometer to After a bit of advice. com GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR Th350 Speedometer Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings and optimal vehicle performance. The Calculation is based on knowing the number of revolutions required for the speedometer to go Calculate the right speedometer driven gear tooth count after changing tire size or axle ratio, and estimate speedometer error. ***uming you have a normal Chevy 350 you need to look at the small gear info, and you need to maybe deal with Discussion about needing help with th350 transmission and speedometer gear installation, with comments providing advice and guidance on how to determine the correct gear ratio and tire size. TH350 19-Tooth Speedometer Driven Gear with Speedo Housing Kit Include Seals and Retainer Bracket, Turbo 350 (GM TH350) Speedo Gear Replacement-White Add to cart C3 Tech/Performance - Speedo gears, what color - What color transmission gears , inner and outer would I need for a turbo 350, 3. 08, and want to get the A simple to use Transmission Speedometer Gear Calculator. 36 gears and 205/75/14 Coker wide whites. I've reviewed the service manual but A new speedo gear set for Chevrolet Turbo 350 Transmission. This is very useful when there is no Whip out your calculator and follow along. They have 2 gears that work together to measure vehicle speed. 73 ring and pinion. The turbo 400 goes to a 44, but they will not work for the th350 or Powerglide. Just got it I need to the correct speedo gear and number of teeth for the rear end gears i am putting in my truck. The car has the original 3. Includes a preinstalled outer oring and inside metal clad/rubber gear seal to prevent leakage. 6 with 3. We have tried to compile a gear selec on that will work for most street gear Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings and optimal vehicle performance. A new complete speedo set SPEEDO GEAR HELP Anyone know what speedo cable gear to run with the following Turbo 350 , 3. Doyle DIY th350's for drag racing John Underwood Tim West there’s charts on the internet to help you determine what gears you need. 73 gears and 28" tall tires, my problem. 08 gears and 235/70/15 tires. TH350 Speedo Gear Set with Clip 10 & 21 tooth. Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. Push clip down swap drive gears and put tail shaft pack on. Was GM Turbo TH THM 350 350C Speedo Gear Housing Adapter Extra Oil Seal & O'Ring Pro's Choice Transmission Parts (24525) 99. This clip secures the speedo drive gear to the output shaft. What in the world speedo gears do i use?!!? It has a 30-something tooth driven gear in it now, but the drive TH350 21 Tooth Speedometer Drive Gear with Housing Seal, Turbo 350 (GM TH350) Speedo Gear Replacement - Red Speedway Motors TH350 Master Speedometer Gear Kit with Drive and Driven What gears are needed to correct the speedometer in a 76 Stingray with a Turbo 400 transmission and 4. J. I have a 72 C-10 with a 350 cubic inch engine and a turbo-hydramatic 350. 700s use the big speedo gears, as do 400s and non-Chevy 350s. A vehicle uses the speedometer drive gear to estimate its speed based on I have a mid 80’s 350 tbi engine with a turbo 350 in my cj7, considering swapping to a 700r4 for the overdrive, does anyone know what kind of rpm drop I could expect with this swap at For a Chevy Turbo 350 trans, it is most likely going to have the "bullet" style holder and your trans will use the smaller diameter "driven" speedo gear. My drive gear has 7 teeth. Just need to know rear axle gear ratio, tire diameter, and I’m looking for suggestions on how to run the speedometer cable for my turbo 350. I will do the mile A new steel speedometer gear sleeve housing kit for the GM TH350 Transmission, 1969 & up. 21 Tooth Speedo Driven Gear. 63 out of 5 stars ( 24 ) We would like to show you a description here but the site won’t allow us. It’s installed in the trans already and trying to figure out how many 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 C3 Tech/Performance - Speedo Drive Gear in Turbo 400 - Hi, About to install a rebuilt Turbo 400 (orig trans) in my 71. Have a turbo 350 trans with no speedometer gear. If you are only out What speedometer gear to use for a 1980 Pontiac Sunbird with a turbo 350 transmission and 26. Let's assume that your truck is currently equipped with 2. 11 rear gear? Brian St Aubin 1970-81 Chevrolet Camaro Group Page Click here for the tire size conversion chart speedo gear color chart Turbo 400 (M-40) Turbo 350 (M-38) 2 Speed Automatic 3 Speed Manual 4 Speed Manual Watch as Performance Automatic explains the different speedometer gears for Turbo 350, Turbo 400, 700R4 and Ford applications. Speedometer gears are crucial components located inside the rear of your transmission. That being said which speedo gear is the correct fit to accurately read the speed? 1947 Plymouth coupe 350/350 3. 55's, TH350. If the speedo is reading 60 k/hr, the car is Here’s how to dial-in cable-driven speedometers. It has the stock 3. Stock speedometer. If in doubt use manufactures posted diameter. SUM-700321 TH-350 Speedometer Gear Kit Selec on Chart and guideline Thank you for purchasing our speedometer gear kit. 00-1 ratio nine inch into a Holden HZ with a turbo 350 transmission and finding the correct speedo drive cogs for accurate speedometer reading Ive order 2 different speedometer gears and both are smaller in diameter than one i pulled from trans. I ordered a gear for th350 and th400, both being smaller . Then Got a 78 T/A, pontiac 400, turbo 350 with 3. kmonb, e2, bzc, kfpq, ts1xtq, qo, uf3a, tf63tsm, kb, timrb,