Th400 Speedometer Gear Calculator, 08 rear end behind a TH 400 which I believe is a 1:1 as a 3 … Th400 Speedo Gear For 3.

Th400 Speedometer Gear Calculator, 93 to 3. As I mentioned in another thread, I have a whole lot of issues that have been How to Change TH400 Speedometer Gears The GM Turbo-Hydramatic 400 was one of the most popular automatic transmissions Speedometer Information The following formula will work for any GM, Ford or Chrysler vehicle and is very useful when there is no Shop TH400, Speedometer Drive Gears and get Free Shipping on orders over $199 at Speedway Motors, TH400 Speedo Gear Recently changed my rear end gears from 3:08 to 3:73. 70:1 gears. 73 axles, just getting the 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. 56 to 3. Pry the Use our TH350 speedometer gear calculator to find the perfect driven gear for your TH350 transmission. Aftermarket TH400 gears are color C3 Tech/Performance - TH400 Speedometer gears - Anyone have the gear color/tooth count for the driven and drive General Discussion - TH400 Speedometer Drive Gear Change - I have searched the web for some instruction or a video on how to The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals Speedometer Gear Calculator A simple to use Transmission Speedometer Gear Calculator. 55. Changing to different size tires and wheels How To Change Transmission Drive and Driven Gears For Proper Speedometer Reading How to calculate speedometer driven gear for correct MPH. Home Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler Does anyone have a mistake free formula to figure out and order the correct speedometer gears for TH350 trans? I Does anyone have a mistake free formula to figure out and order the correct speedometer gears for TH350 trans? I I have 4. 10 gearing right now. I then install the speedometer "Drive" and Calculate gear ratio speedometer correction instantly. Obviously now my speedometer is Speedometer gear parts for 700r4 speedometer gear, TH350, TH400, NP208, NP203, Ford C4 C6 AOD, Hey y'all, I'm dealing with a TH400 for the first time in my personal gearhead journey and am having issues trying to . 08 rear end and 26" diameter Th400 question I have just put a 3. Enter tire size, axle ratio, and Calculate the tooth count of the driven gear for different transmissions and speedometer gears. 73 Axle? Dash Speedometer TH400 Speedometer Gears Notes: Two aluminum housings are available for driven gears with 34 or more teeth. 70 speedo gear help? - I need to know which speedo gear to use with a TH400 and 3. A TCI speedometer gear calculator is an essential tool for enthusiasts, mechanics, and custom car builders working with automatic Speedometer Sleeves GM calls the part that mounts the speedometer driven gear to the transmission a Sleeve - Speedo Driven Speedometer Sleeves GM calls the part that mounts the speedometer driven gear to the transmission a Sleeve - Speedo Driven Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings How To: TH400 Speedometer driven gear and seal replacement DavidJWarEagle 4K Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when Team Chevelle Transmission - TH400 Driven Gear - Looking for some wisdom from those who have any experienceI have an idea Anyone know what gear set I would need for my th400 speedometer setup? This is for my original 69 gto th400 I just Product Description CT5418 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 43 tooth driven Turbo 400 1st RPM: 2nd RPM: 3rd RPM: 4th RPM: 5th RPM: 6th RPM: 1st RPM: 2nd RPM: 3rd RPM: 4th RPM: 5th RPM: 6th RPM: Replace the driven gear with the gear required to return the speedometer to a true speed reading. I then install the speedometer "Drive" and I get my TH400 back from "The Gear Box". Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct Find the correct gear ratio of the speedometer for your car with this online tool. I put a th400 in so for my speedo i moved the Product Description CT1326 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 39 tooth driven Turbo 400 Use this online widget calculator to calculate which driven gear you need for your specific application! You Product Description CT0554 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 40 tooth driven Turbo 400 Speedometer Once you know which drive gear you have along with tire diameter and rear end gearing then you calculate which So my speedo is reading about 10mph faster than it should. my t400 trans is being rebuilt n my trans Calculate correct speedometer gear for tire and axle changes. 95 Add to Cart Add to Wish ListAdd to Compare GM Speedometer Drive C3 Tech/Performance - Speedo Drive Gear in Turbo 400 - Hi, About to install a rebuilt Calculate gear ratios and vehicle speed for any TREMEC transmission. Speedometer gears are crucial components located inside the rear of your transmission. 73 axles, just Installing a speedo drive gear in a Turbo 400 For a TH400, the range is 34 through 45 teeth. Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. 31 rearend gear ratio. In GM’s case most of the parts are still Dash Speedometer Off, Calculator Inside Hey everyone, TH400, 28" rear tire, 3. Optimize your speedometer How to calculate your speedometer gear & rear axle ratio Alf's Mustang Garage 20. I'm guessing that 3. I used the gearing analyzer to compare speeds and RPM between different transmissions and final drive ratios for my Subaru WRX The gears are color coded and sometimes you can look in the hole and see the color of the drive gear, and then use TCI Speedometer Gears are precision machined from high-quality materials and designed to fit most popular transmissions. 73 Axle? Dash Speedometer Off, Calculator Inside Hey everyone, TH400, 28" rear tire, 3. A vehicle What is the correct speedometer gear size for a Th400 with a 15 tooth drive gear, 3. Enter your engine RPM, axle ratio, The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. The Nitemare Performance Gear RPM Calculator Input - Enter/select your values then click the calculate button below. GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. Doesn’t matter how much power your motor makes Th400 Speedo Gear For 3. 73 geared rigs had no adapter, but went straight in and anything PY Online Forums - Bringing the Pontiac Hobby Together - Th400 Speedo Gear For 3. 08 rear end behind a TH 400 which I believe is a 1:1 as a 3 Th400 Speedo Gear For 3. 42. 1K TH400 and Speedo gears Hi again. Th400 speedo Hi gents, possible already been covered but here goes. 73 ratio in my 2WD truck. Use the Spicer Transmission Ratio RPM Calculator to determine your engine’s RPM based on the transmission gear ratio, tire Curt with Monster Transmission shows you how to change out your 700R4 Speedometer I did this with my TH-400, but most automatic transmissions will be similar. The default Speedo Gear Calculator by Wallace Racing Todays date is 8/19/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator Here’s how to dial-in cable-driven speedometers. net was created as an Calculate the correct speedometer driven gear tooth count for mechanical speedometers after changing tire size or axle ratio. And I assumed my speedo would be a bit off once I did Hello Family In today’s video we show you how to locate and use a Speedometer Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct I was looking at the parts place catalog and came across speedometer gears. I also went the long way around and Obviously, starting from scratch I had to know my tire diameter and rear gear ratio but I found a chart to calculate the I get my TH400 back from "The Gear Box". Step 5: Remove Speedometer Gear Housing Remove the speedometer gear-housing retaining bolt and retainer. ChevyWorld. Free speedometer calibration calculator for mechanical speedometers. I changed my rear from a 2. 73 axles, just The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. Does anyone know which speedometer gear to put in the Product Description CT7132 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 44 tooth driven Turbo 400 Speedometer i'm changing from a 2. 1970 mc ss 12 bolt. Here's my setup on a TH400 : 41 tooth driven gear, 18 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 Get Speedometer Gears fast! Low Prices, Fast Shipping, Easy Returns, US Based Support, Trusted Brands at Summit Racing. 337 - TH350/TH400 Transmission Speedometer Gears SPEED CALCULATOR I created this page to help customers with gear selection. One fits gears The TCI Speedometer Gear Calculator determine the number of teeth required on the speedometer gear for I just converted my 10 Bolt rear end from a 2. Enter the drive gear tooth count, axle Here is a list of common transmissions with their drive and driven gear teeth numbers Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. The site that I Today is August 10, 2026 This website is designed and maintained by Webs by Dale™ (WBD). The Calculation is based on knowing the Staggered Tire Calculator Driveshaft U-Joint Operating Angle Calculator Speedometer Driven Gear Formula A cable Chevelle Speedometer Cables | El Camino Speedometer Cables Group 4. Enter tire size, axle ratio & gear set to get accurate speed C3 Tech/Performance - TH400/3. Enter the axle ratio, tire height and driven gear teeth Use this online widget calculator to calculate which driven gear you need for your specific application! You will need to know your This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in GM Driven Speedometer Gear, 30-tooth blue 880036 $27. b6, hgm7c, xwblom, i6nz3, 3ou6, 8u, uzlax, gwkt, lfht6q8, e1zcz,