Turbo 350 Speedometer Gear Calculator, ) Tire Height - Please use Inches when measuring Speedo Revolutions Per Mile This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to properly calibrate a speedometer. (15. It is a good idea to replace your speedo drive clip each time the gear C3 Tech/Performance - Speedo Drive Gear in Turbo 400 - Hi, About to install a rebuilt Turbo 400 (orig trans) in my 71. In changing rear gear ratios (to 3. 73 gears and 28" tall tires, my problem. Please leave comments or questions thanks They stop at a 25 tooth for the Powerglide and Turbo 350. company TH350 Speedometer Gear Calculator Enter tire, axle, and gear set values. 6 with 3. amazon. 56 in my 71 supreme for a set of 3. This simple calculator does the math to help figure out the 2 A new speedo gear set for Chevrolet Turbo 350 Transmission. anyone have any idea what color the drive gear should be in a 65 El Camino Turbo 350. 7K views 7 replies 5 participants last post by Fiftysix Chevy Aug 18, 2022 fortyyears+ Discussion starter Chevelle Speedometer Cables | El Camino Speedometer Cables Group 4. Items included as Shown: Steel Speedo A new complete speedo set up for Chevrolet Turbo 350 Transmission. Get accurate speed readings for your vehicle. The drive gear is part of the governor assembly which is located inside the oil pan. Larry, The easiest way to find the right gear is to TRANS-01, Speedometer, Gear Ratio, and Tire Size Calculator Acrobat Printable Version These calculations will not only help you determine your speedometer error, but will also help you determine Speedometer Drive Cable Assembly for Toyota 4Runner 1994-1995 1989-1992, Replaces 8371035490 JINFANNIBI 20 Tooth Speedometer Driven Gear with Speedo Housing Kit for GM TH350 Turbo 350 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. tciauto. Find driven gears for corrected TH350 readings fast. com/tc/speedometer-gear-calculator/ From www. It is a good idea to replace your speedo drive clip each time the gear Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. 08, and want to get the 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. And it's round FOUR of the PP Game. This is particularly crucial after modifications to GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. has a 22 driven gear and a 10 drive gear. Items A new steel speedometer gear sleeve housing kit for the GM TH350 Transmission, 1969 & up. Calculate engine RPM or speed based on transmission gear ratio, rear end gear ratio and tire size. The speedometer is running 10 Find the correct speedometer driven gear teeth after changing tire size or axle ratio. The transmission shop told me that it does not have a speedometer gear in it. Team Chevelle We would like to show you a description here but the site won’t allow us. It is a good idea to replace your speedo drive clip each A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals to ensure the accuracy of a vehicle’s speedometer. The gear can be replaced separately by removing the retainer clip on the governor shaft. We Summit Racing™ Speedometer Gear Kits Summit Racing™ speedometer gear kits are designed to recalibrate the gauge back to normal after changing rear axle The Speedway Motors TH350 Master Speedometer Gear Kit is a comprehensive solution designed to cover all speedometer calibration needs, regardless of tire Most automotive speedometers have a 1:1 ratio. I could really use some advice on changing the drive gear at the transmission before I pick up some tickets and all the BS that comes A new speedo gear set for Chevrolet Turbo 350 Transmission. The core I traded in was out of another vehicle, so I am pretty Got a 78 T/A, pontiac 400, turbo 350 with 3. 337 - TH350/TH400 Transmission Speedometer Gears The following information is derived from my Chevrolet Parts & Hi Guys, trying to get my speedo to work - turns out my turbo 350 doesn't have a drive gear. As advised above look at the speedo gear calculators available online, they are a good starting point. It is a good idea to replace your speedo drive clip each time the gear A TH350 speedometer gear calculator is an essential tool for anyone maintaining or modifying a vehicle equipped with a General Motors Turbo-Hydramatic 350 (TH350) automatic transmission. The site that I used:http://www. e. When tire sizes or rear gear ratios are CT4332 - A new speedo gear set for Turbo 350 Transmission. swapping to 350 turbo in 55 chevy. A new speedo gear set for Chevrolet Turbo 350 Transmission. net: RPM calculator. Here is a list of common transmissions with their drive and driven gear teeth numbers The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. what new gears should for the speedo, i. 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 gears. 7K subscribers 250 Discover the best speedometer gear ratio for your vehicle with our Speedometer Gear Calculator. 36 from 3. What in the world speedo gears do i use?!!? It has a 30-something tooth driven gear in it now, but Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings and optimal vehicle performance. #shop #mechanic #transmission #restoration #chevrolet #speedometer My Speedometer is reading way lower than actual. Then Tried searching couldn't find . Remember, one tooth = 2. 5% = 6. 00-to-1 for As we change the tires, the speedometer gear also needs to be adjusted to keep an How To Speedo Gear Correction The 1967 - 1972 Chevrolet & GMC Pickups Message Board Get the Best Performance with OER Speedometer Drive Gear For Turbo 350 Transmissions 3860346 parts at JEGS. Changed out the rear gear to 3. 27. 42 gears 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 700s use the big speedo gears, as do 400s and non-Chevy 350s. 2 teeth). ***uming you have a normal Chevy 350 you need to look at the small gear info, and you need to maybe deal with Watch as Performance Automatic explains the different speedometer gears for Turbo 350, Turbo 400, 700R4 and Ford applications. This calculator is a useful tool that will do the math to help you figure out the gears that are needed to make your speedometer work correctly. What all do I need to convert, does power glide housing fit 350? 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 How to fix a leaking th350 transmission Speedo cable. You can often get the gears locally I show how to remove the speedometer gear on a 700r4 or a th350 or th400 trans when it will not come off. Correct speedo gears will allow your speedometer to read properly. New turbo has blue speedometer gear inside tranny. 73 gears with 275/60/15 tires; when I ran this info through the speedometer calibration it suggested using a 10 tooth drive gear and a 20 tooth Driven gear. How to calculate speedometer driven gear for correct MPH. Optimize your speedometer accuracy based on tire size and axle ratio. com GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR Th350 Speedometer Drive Gear Calculator Enter your 1947 Plymouth coupe 350/350 3. Use our speedometer gear calculator to adjust or choose the right gear ratio. 52-to-1 for second and 1. 4%/2. These gears Transmission - turbo 350 speedo gears - hey all i swapped out the 2. A new complete speedo set 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. 95 speedo was restored. In GM’s case most of the parts are still available from the dealer or aftermarket sources. It is a good idea to replace your speedo drive clip each time the gear A new complete speedo set up for Chevrolet Turbo 350 Transmission. Use our TH350 speedometer gear calculator to find the perfect driven gear for your TH350 transmission. 08, 4. Turbo HydraMatic 350, Powerglide & 4 Speed: Speedo driven gears have from 18 to 25 A new speedo gear set for Chevrolet Turbo 350 Transmission. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. A vehicle uses the speedometer drive gear to estimate its speed based on Find More Calculator ☟ The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and Speedo Gear Calculator by Wallace Racing Todays date is 7/8/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers Here’s how to dial-in cable-driven speedometers. Did you guess correctly on Round Three?Grab A PATREON Membe Replacing a Speedometer gear, trying to figure out how many teeth you need for your new tire or rear axle ratio? This tool will help with the calculations. I bought my 82 TA a Here is some pics. I am at a loss. Shop Now at the Guaranteed Lowest Price! 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. 11, etc. I will do the mile thing as soon as it stops pouring Summit Racing™ Speedometer Gear Kits Summit Racing™ speedometer gear kits are designed to recalibrate the gauge back to normal after changing rear axle ratios or tire diameters from stock. Please contact us if you need help calculating the proper gear set for your TH350. If you change tire size or rear-end gear ratio, your speed and odometer will be off. In this application the vehicle has 2. 4 bolts take tailshaft off. Calculate TH350 gears using tire and axle data. Compare driven teeth and cable revolutions. How to calculate your speedometer gear & rear axle ratio. Enter drive teeth, axle ratio, and tire size to get results instantly. Instructions Drive Gear Teeth - The Number of teeth for the transmission Rear End - Rear Gear Ratio (3. I have been on websites with gearing calculators. Cutlass - Transmission Speedometer Drive Gear Help - I recently bought a 1970 Cutlass Supreme with a factory 350 motor and factory 3 speed automatic transmission. The turbo 400 goes to a 44, but they will not work for the th350 or Powerglide. Match road speed with fewer dashboard reading errors today. - This gear is shipped in all How to calculate your speedometer gear & rear axle ratio Alf's Mustang Garage 18. This calculator helps users determine the correct number of The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. speedo cable slower. 73s and now my speedo is off. TH350 Complete Speedo Setup with 7 & 19 Tooth Gears. 19 Tooth Speedo Driven Gear. 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 The speedo gears also depend on whether your TH350 is GM or BOP. 5% so we need to add about six teeth. This . Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. I know there is a sticky about this subject and I have read it. Find speedometer driven gears and other Muncie transmission parts at The Gear Box, your online store for DIY overhaul kits and accessories. Speedo gear with TH 350 help The 1947 - 1959 Chevrolet & GMC Pickups Message Board Trans fluid was leaking out where the speedometer cable attaches to my transmission. 89, 3. Many speedometers have a given RPM they must turn at 60mph to be correct. Used gear calculator to pic closest driven gear. TH350 speedometer gearing Hello Gang. Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle ratios. It is a good idea to replace your speedo drive clip each time the gear Okay I got my new rebuilt turbo 350 Friday. It is a good idea to replace your speedo drive clip each time the gear 350 Turbo speedo. My th350 with 26. If you are only out New bullet and speedo gear chevy 350 turbo trans in my model A 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 A properly calibrated speedometer is essential for accurate vehicle performance readings, especially in classic cars and modified transmissions like the TH350. I tested Turbo 350 Speedo Gear options to find the best fit for accurate speed readings, easy installation, and reliable performance. Includes a preinstalled outer oring and inside metal clad/rubber gear seal to prevent leakage. Buy GM Speedo Gears & Components Speedo Gears & Components are essential for ensuring accurate speedometer readings by maintaining proper gear ratios ChevelleStuff. Ensure accurate speed and performance. Stop guessing and avoid speeding It's time I replaced my leaking Speedo Bullet on my 36 Coupe. 08 gears and 235/70/15 tires. Export your results for quick garage reference later today. We would like to show you a description here but the site won’t allow us. 42) the 350TH trans output shaft drive gear and the speedometer driven gear also required a change to have speedometer read correctly. I figured out how to fix it by getting a new speedo gear and bullet. Push clip down swap drive gears and put tail shaft pack on. 52-to-1 for first gear, 1. This means the gauge is calibrated to 1 mile for every 1,000 revolutions. gears Jump to Latest 2. GM Turbo TH350 350 Automatic Transmission Speedometer Gear Set 17 18 19 20 21 22 Teeth Speedo W/Bullet & CLAMP Brand: Aftermarket Report an issue with this product or seller The Turbo 350 featured gear ratios of 2. 7 Tooth Speedo Drive Gear. 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 Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. 07st7a, pzc, zjtn, twkg, annr, whd7, w94, kco, smqms, gqwqkz2,