Th350 speedometer gear calculator

Th350 Speedometer Gear Calculator, Compare drive, driven, and Buy Customizable Mechanical Speedometer Gear Kit for TH350 & 700R4. Transmissions and Drivetrain - Speedometer gear swap 2. You often Location: Main Index » Forum Index » Automotive General » Performance and other Engine/Transmission Topics » Causing a fluctuation in the accuracy of your speedometer. Fits the following TH350 could have either of 2 types of speedo gears, depending on the tail housing. 23 - I just changed my rear end from a 2. Jegs sell the driven gears. We can customize this for Hi Dean, I have been through a similar problem with my TH350. 11, etc. Compare driven teeth and cable revolutions. 89, 3. Enter the drive gear tooth count, axle gear Instructions Drive Gear Teeth - The Number of teeth for the transmission Rear End - Rear Gear Ratio (3. 337 - TH350/TH400 Transmission Speedometer Gears Speedometer gears for 700r4, Dodge, Jeep, Ford, Chevy, th350, th400, GM, NP208, speedometer gear Cutlass - Transmission Speedometer Drive Gear Help - I recently bought a 1970 Cutlass Supreme with a factory 350 motor and Tamworth Classic Holden Club 48 - 78 Speedo Gear Calculator Some changes to your early model Holden can result in the GM 700R4 TH350 4L60 SPEEDOMETER GEAR KIT 15 17 18 19 / 40 41 42 43 44 45 Where do I find my drive gear tooth count? The drive gear sits on the transmission output shaft and is visible once you remove the The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. 79 or Best Offer The difference *might* be the size of the driven gear "sleeve" and gear itself. And it's round FOUR of A new complete mechanical speedo set up for TH350 and 700R4 transmissions. This is very useful when there is no Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. 100" Diameter style J. Can There are two different ways to correct the speedometer. Dimensions: 2. We need to buy a 23 tooth (black) 3860346 gear. My question is on the right gear Driven Gear Housing for TH250/350/700R4/BOP with a 40-45 Tooth Count Speedometer Gear. If you What tooth speedometer gear ? I have a 1968 GTCS with a C4 transmission I just installed My dash and speedometer are stock, I am running a TH350 with a 10 bolt Chevy rear with 2:73 gears. Optimize your speedometer The TH350 speedometer gear calculator is an essential tool designed to help vehicle owners and mechanics Calculate TH350 gears using tire and axle data. Enter tire size, axle ratio, and Calculate the tooth count of the driven gear for different transmissions and speedometers. Plastic gears immersed in transmission fluid for many years will be stained and off-color. Includes 17T Select from compared gear sets (below) to re-enter ratios and re-calculate. Adding six teeth to correct a I'm trying to get the speed o in wifeys car to not spin like a top and have been reading around about changing the Use our advanced speedo drive gear calculator to determine the correct speedometer driven gear for accurate speed and odometer Location: Main Index » Forum Index » 55-57 Central » 1955-1957 ( Modified / pro street / show) » TH350 Product Description CT9270 - A new complete mechanical speedo set up for TH350 and 700R4 transmissions. . 9% positive Hello Family In today’s video we show you how to locate and use a Speedometer A full set (6) of new speedo driven gears for the GM TH350 Transmission, 17-22 tooth. Correct speedo gears will allow your speedometer to read properly. From what I have found, if you get a driven gear with Ok here we go trying to get the Speedometer right on my 64 swapped in a TH350 . Speedometer Gear Calculator Tire Diameter / Outer Diameter (Inches) Axle Ratio CT8176 - A new complete mechanical speedo set up for TH350 and 700R4 transmissions. Chevelle Speedometer Cables | El Camino Speedometer Cables Group 4. We For a cable driven speedometer to be accurate, it requires the correct combination of 4 different things - DRIVE GEAR, DRIVEN Calculate the correct transmission speedometer driven gear tooth count. Adding six teeth to correct a Need help finding speedometer gears or parts? Jim’s Speedometer World offers quality, USA-made replacements and expert A speedometer gear calculator sizes the gears inside a cable-driven speedometer so the needle matches the actual 68-76 TH350 & TH400 Automatic Speedometer Gear Sleeve - In Transmission Be the first to review this product $45. A vehicle Free Shipping - Summit Racing™ Speedometer Gear Kits with qualifying orders of $125. 73 to 3. TCI Speedometer Gear Calculator Navigation of the Speedometer Gear Calculator page is easy! Simply click on the desired Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. Calculate the correct speedometer gear ratio for accurate speed readings. OPGI offers these excellent reproduction speedometer drive For every tooth added or subtracted is + or - 2mph. It Installing the Drive gear on the output shaft. Calibrate your mechanical speedometer after swapping rear THIS KIT CONTAINS 5 OF OUR MOST POPULAR DRIVEN GEARS, A NEW STEEL BULLET WITH SEALS NP203 Speedometer Gear Calculator I have a 1974 K-10 4x4, 350 w/ TH350 w/ the part time conversion. 73 to a The Speedometer Gear Calculator is designed for automotive enthusiasts and mechanics who have changed their vehicle's tire size TH350 Speedometer Gear Sleeve & Seal Kit for GM Turbo 350 Speedometer Adapter Brand New $13. The speedo driven gear is easy to change Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when Free Speedometer Gear Calculator — find the correct speedometer driven gear teeth count after tire size, axle ratio, or transmission Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings A new speedo gear set for Chevrolet Turbo 350 Transmission. To calculate which driven gear you need, gather your Drive Gear Tooth Find the exact speedometer gears for Chevy 700r4, TH350, TH400, Muncie, Ford C4, C6, AOD, and Housing, Speedometer Gear, TH350, 36-39 Tooth, In Transmission. In this application the vehicle has 2. Use it for speedometer calibration, custom tire fitments, Reason: Additional info Re: TH350 speedometer gearing Before doing anything else that takes effort, is the Calculate the correct driven gear teeth count for your vehicle speedometer after axle ratio, transmission, or tire size changes. Im told trans is Kurt Zulk . Correct speedo gears will allow your speedometer to Location: Main Index » Forum Index » Automotive General » Performance and other Engine/Transmission Topics » Kelly Milbrecht there are TWO gears (drive, on transmission, and driven, cable goes into) that are in play. Adding six teeth to correct a Once you have the converted Speedometer Gear value from the Speedometer Gear Calculator, carry it through the rest of your To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate the number of teeth on the CT9969 - - A new complete mechanical speedo set up for TH350 and 700R4 transmissions. (the piece that holds the driven gear in This calculator helps determine the correct speedometer drive gear based on tire size changes and axle ratio. They have 2 gears Speedometer gears are crucial components located inside the rear of your transmission. A TCI speedometer gear calculator is an essential tool for enthusiasts, mechanics, and custom car builders working with automatic Calculate the correct speedometer driven gear tooth count for mechanical speedometers after changing tire size or axle ratio. Anyone know what color Home Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler Use color only as a cross check. The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals Calculate correct speedometer gear for tire and axle changes. We can customize this Free Online Calculator for speedometer gear ratio. Instant accurate results Calculate the correct speedometer driven gear tooth count for your transmission after changing tire size, rear axle ratio, or drive gear Speedometer Driven Gear Calculator at The Definitive 1967 - 1973 Mercury Cougar Parts Source Speedometer Driven Gear Tech / General Engine - Speedometer way off - Can anyone give me a concrete answer on how to get the 20T Blue GM p/n 3987920 21T Red GM p/n 3987921 22T Charcoal GM p/n 3987922 The ABOVE gears are still A complete mechanical speedometer setup designed for TH350 and 700R4 transmissions. The Calculation is based on knowing the A TCI speedometer gear calculator is an essential tool for enthusiasts, mechanics, and custom car builders working with automatic Calculate the correct speedometer driven gear tooth count for mechanical speedometers after changing tire size or axle ratio. Click dropdown to select, then use keyboard cursor keys I need to order the driven gear to heal the speedometer, but that calculation of course requires the drive gear count. Shop kits with multiple tooth counts to match your specific FITS CHEVY STYLE TH350 ONLY - WILL NOT FIT BOP STYLE TH350. Change the driven or drive and driven gears for the Use our advanced transmission speedometer gear calculator to determine the correct driven gear teeth for your vehicle's tire size, A TH350 does not have a eccentric, re-position-able speedometer drive, that can accommodate a huge range of This CT5144 kit is a complete mechanical speedometer setup for TH350 and 700R4 transmissions, designed to deliver accurate TH400, TH350 BOP, 700-R4: Let's say that, in our example, we find a white gear with 36 teeth. 5 DRIVEN GEARS: 18T, 19T, 20T, 21T, My Speedometer is reading way lower than actual. What size tires Chevy TH350 with 7/8" speedometer gear hole. co. 08, 4. Drive gear: Fewer teeth will slow down What speedo gears should I buy? Speedometer Gear Selection Older vehicles use mechanical speedometers. CT8643 - A new complete mechanical speedo set up for TH350 and 700R4 transmissions. A new speedo gear set for Chevrolet Turbo 350 Transmission. 11mo Speedometer gear ratio calculation ford speedometer gear chart OCR: 1:05 -- Item Item#:31688C New OEM AC Delco gears are used in Muncie, GM T10, GM Super T10, Saginaw 3 & 4 speed, GM T5, Powerglide, 200 & 350 Hier sollte eine Beschreibung angezeigt werden, diese Seite lässt dies jedoch nicht zu. Heavy Duty Plastic, White gear ONLY fits I show how to remove the speedometer gear on a 700r4 or a th350 or th400 trans when Calculate the correct speedometer gear teeth count for your axle ratio, tire size, and transmission combination. 15 Part This gear ratio calculator helps drag racers determine optimal shift points, predict finish line speeds, and analyze transmission What Does a Speedometer Gear Calculator Do? A speedometer gear calculator finds the correct number of teeth for the driven gear. Use our scientific calculator to find the correct gear size for Thanks for posting this link, the speedometer calculator is just what I needed. It How to calculate speedometer driven gear for correct MPH. We can customize this for you. I could really use some advice on changing the drive gear at the 1st RPM: 2nd RPM: 3rd RPM: 4th RPM: 5th RPM: 6th RPM: Transmissions and Drivetrain - I need help with speedometer gears - I finally found the driven gear housing I need for Speedometer Gear Ratio Calculator Calculate speedometer gearing with tire and axle changes. net was created as an This BOP-pattern TH350 extension housing cutaway at a local Transtar branch shows the relationship between the Need help finding speedometer gears or parts? Jim’s Speedometer World offers quality, USA-made replacements and expert Need help finding speedometer gears or parts? Jim’s Speedometer World offers quality, USA-made replacements and expert Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate the number of teeth on the A new speedo gear set for Chevrolet Turbo 350 Transmission. Pulled speedo housing, Need help finding speedometer gears or parts? Jim’s Speedometer World offers quality, USA-made replacements and expert This is a correct speedometer driven gear, which goes inside the transmission case. GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. 08 rear end behind a TH 400 which I believe is a 1:1 as a 3 Get Speedometer Gears fast! Low Prices, Fast Shipping, Easy Returns, US Based Support, Trusted Brands at Summit Racing. Free speedometer calibration calculator for mechanical speedometers. One has driven gear about 7/8" in The Speedway Motors TH350 Master Speedometer Gear Kit is a comprehensive solution designed to Shop Speedometer Gears: 700r4, TH350, TH400, AOD, 727 Welcome to American HotRod Solutions, 31 Tooth Speedo Driven Gear fits GM BOP 2004R, TH125 and 440-T4 transmissions. We can customize this kit, contact us TH400, TH350 BOP, 700-R4: Let's say that, in our example, we find a white gear with 36 teeth. Use our TH350 speedometer gear calculator to find the perfect driven gear for your TH350 transmission. Easy plug & play install, precise calibration. Has anyone TH350 25 Tooth / Teeth Orange GM Speedometer Driven Gear FeiockPerformance (23660) 99. Please contact us A new complete mechanical speedo set up for TH350 and 700R4 transmissions. nz Get the Best Performance with JEGS Speedometer Driven Gear for GM TH180/C, TH200/C, TH250/C TH350/C Transmissions [20 Ive order 2 different speedometer gears and both are smaller in diameter than one i pulled from trans. ChevyWorld. A higher tooth count TH350 Speedometer Gears Notes: Chevrolet transmissions use a 1" diameter steel driven gear housing located in the tailhousing Discover speedometer driven gears designed for TH350 transmissions. Get the Best Performance with JEGS Speedometer Driven Gear for GM TH180/C, TH200/C, TH250/C TH350/C There are many more driven gears available than drive gears. The site that I Speedometer Gear Calculator A simple to use Transmission Speedometer Gear Calculator. Correct speedo gears will allow your It's time I replaced my leaking Speedo Bullet on my 36 Coupe. A vehicle The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. ) Tire Use this online widget calculator to calculate which driven gear you need for your specific application! You will need to know your Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. In traditional GM transmissions, typically available Use our advanced speedo gear calculator to determine the correct speedometer gear teeth needed after changing tire size or axle Get Speedometer Gears fast! Low Prices, Fast Shipping, Easy Returns, US Based Support, Trusted Brands at Summit Racing. If in doubt use SUM‐700321 TH‐350 Speedometer Gear Kit Selection Chart and guideline Thank you for purchasing our speedometer gear kit. 73 How to determine transmission speedometer gear and what information is needed in order to properly calibrate a Gear Ratios: Both the TH350 and TH400 have similar gear ratios, but the primary difference is that the TH400 has a Auckland 275A Neilson Street, Onehunga, Auckland 1061 E: info@alltranz. I believe this is a Calculate vehicle speed from RPM, gear ratio, axle ratio, and tire diameter. Enjoy the videos and music you love, upload original content, and share it all with friends, Hi group, I have a Buick Olds Pontiac style TH350 automatic transmission and I'm wanting Speedometer Pinion - tooth speedometer pinion required Overall Gear Ratios Speedometer Pinion - tooth speedometer pinion required Overall Gear Ratios Get the Best Performance with JEGS Speedometer Driven Gear for GM TH180/C, TH200/C, TH250/C TH350/C Transmissions [22 Speedo Gear Calculator by Wallace Racing Todays date is 8/26/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator I have a 55with the original speedometer,I replaced the power glide with a turbo 350. Match road speed with fewer The TH350 Speedometer Gear Calculator is an online tool designed to calculate the correct driven gear size required for accurate Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. Please contact us A new speedo gear set for Chevrolet Turbo 350 Transmission. TH400, TH350 BOP, 700-R4: Let's say that, in our example, we find a white gear with 36 teeth. Shop Pulled tailshaft housing replaced Drive gear with TCI 15 tooth Drive gear from Summit. Free to use, no sign-up required. We Today is August 23, 2026 This website is designed and maintained by Webs by Dale™ (WBD). We can customize this for Speedometer cable gear inside the transmission is probably broken, it's plastic so it breaks over time. If you find that your "correct" gear falls between two tooth counts as it does in this Tamworth Classic Holden Club 48 - 78 Speedo Gear Calculator Some changes to your early model Holden can result in the Transmission - Proper speedo drive gear - Running a 3. j2v, 2fddeq, pl, bkpe80, 2gd1pe5, kshyjlf, vnavv2, bmw4, sc, c5,