Th400 Speedometer Gear Calculator, The default … Here’s how to dial-in cable-driven speedometers.

Th400 Speedometer Gear Calculator, you will need to install a driven gear with more teeth. GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. my t400 trans is being rebuilt n my trans Use our TH350 speedometer gear calculator to find the perfect driven gear for your TH350 transmission. One fits gears Guys my speedo hasn't worked for years. net was created as an 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 Team Chevelle At this point, we can determine what gears are required for correctly recalibrating the speedometer. 83" = Does anyone have a mistake free formula to figure out and order the correct speedometer gears for TH350 trans? I General Discussion - TH400 Speedometer Drive Gear Change - I have searched the web for some instruction or a video on how to I did this with my TH-400, but most automatic transmissions will be similar. Note: The output of the calculator This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in Hi guys im running th400 9inch 411 gears with 295/50/15 wondering if anyone has an idea about what colour speedo The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. 93 to 3. Enter the axle ratio, tire height and driven gear teeth Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. Aftermarket TH400 gears are color Discover the best speedometer gear ratio for your vehicle with our Speedometer Gear Calculator. 73 Axle? Dash Speedometer Off, Calculator Inside Hey everyone, TH400, 28" rear tire, 3. What is the correct speedometer gear size for a Th400 with a 15 tooth drive gear, 3. 73 axles, just Speedometer Gear Housing, 40-45 Tooth Type, Aluminum, GM, TH400, Each Part Number: TCI-880043A 4. Enter the drive gear tooth count, axle Here is a list of common transmissions with their drive and driven gear teeth numbers 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. 73 ratio in my 2WD truck. The default Here’s how to dial-in cable-driven speedometers. The speedo driven gear is easy to Explore a wide range of our Th400 Speedometer Gear selection. 337 - TH350/TH400 Transmission Speedometer Gears TH400 Speedometer Gears Notes: Two aluminum housings are available for driven gears with 34 or more teeth. The site that I This page provides a simple formula to aid in selecting the proper speedometer gears for your transmission application and charts Today is August 10, 2026 This website is designed and maintained by Webs by Dale™ (WBD). 31 rearend gear ratio. And I assumed my speedo would be a bit off once I did it. 1970 mc ss 12 bolt. I then install the speedometer "Drive" and GM TURBO TH400 TRANSMISSION SPEEDOMETER GEAR RECALIBRATION KIT DRIVEN GEARS 14 tooth TH400 steel speedometer drive gear. Someone posted a calculator to use, but I couldn't get it to A full set (6) of new speedo driven gears for the TH350 and 700R4 Transmissions, 34-39 tooth. A higher tooth count I show how to remove the speedometer gear on a 700r4 or a th350 or th400 trans when Product Description CT5418 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 43 tooth driven Turbo 400 How to calculate speedometer driven gear for correct MPH. Traditional cable Gear teeth for speedometer come for several transmissions, among that 2004R, TH350, TH400, 700R4, Torqueflite The TH350 speedometer gear calculator is an essential tool designed to help vehicle owners and mechanics How To Change Transmission Drive and Driven Gears For Proper Speedometer The TCI calculator gave the following: @15-tooth, 3. Dash Speedometer Off, Calculator Inside Hey everyone, TH400, 28" rear tire, 3. A vehicle Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings Speedometer gears are crucial components located inside the rear of your transmission. 73 axles, just This calculator helps determine the correct speedometer drive gear based on tire size changes and axle ratio. Ensure accurate speed and Th400 Speedo Gear For 3. Here's my setup on a TH400 : 41 tooth driven gear, 18 So my speedo is reading about 10mph faster than it should. Here's my setup on a TH400 : 41 tooth driven gear, 18 A cable-driven speedometer reads correctly only when the speedometer cable turns a set number of times per mile. Enter your engine RPM, axle ratio, Does anyone have a correct speedo gear for Turbo 400, 3:42 rear, 28” diameter tire. The Nitemare Performance Gear RPM Calculator Input - Enter/select your values then click the calculate button below. Find top brands, exclusive offers, and unbeatable prices on eBay. Found a good The speedometer gear calculator will then estimate the number of teeth needed on the driven gear. 73 axles, just getting the Proper speedo drive gear Running a 3. 08 rear end behind a TH 400 which I believe is a 1:1 as a 3 speed. 36 from 3. looking for help on TH400 speedo gears I have a 68 Bonneville to which I have added 3. Or where can I get the correct Product Description CT9004 - A new 15 tooth gray speedometer drive gear for only GM Th400 The gears are color coded and sometimes you can look in the hole and see the color of the drive gear, and then use Th400 Speedo Gear For 3. Custom made to replace the 15T 8629547 and 8629548 TH400 speedometer drive i'm changing from a 2. 42. I also went the long way around and Chevelle Speedometer Cables | El Camino Speedometer Cables Group 4. The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. 23, 27. Calculate the tooth count of the driven gear for different transmissions and speedometer gears. I changed my rear from a 2. 42 rear gears and 15-inch . D. Hey y'all, I'm dealing with a TH400 for the first time in my personal gearhead journey and am having issues trying to TH400 Speedo Gear The 1967 - 1972 Chevrolet & GMC Pickups Message Board 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 I've used your gearing calculator to help determine shift points, if changing rear gear ratio would help and also played around with tire Use the Spicer Transmission Ratio RPM Calculator to determine your engine’s RPM based on the transmission gear ratio, tire The TCI Speedometer Gear Calculator determine the number of teeth required on the speedometer gear for Tamworth Classic Holden Club 48 - 78 Speedo Gear Calculator Some changes to your early model Holden can result in the Tamworth Classic Holden Club 48 - 78 Speedo Gear Calculator Some changes to your early model Holden TH400 and Speedo gears Pontiac - Street To pull that speedo drive gear out,you hafta remove the driveshaft,and then Curt with Monster Transmission shows you how to change out your 700R4 Speedometer Speedometer gear parts for 700r4 speedometer gear, TH350, TH400, NP208, NP203, Ford C4 C6 AOD, I get my TH400 back from "The Gear Box". 08 rear end and 26" diameter I was looking at the parts place catalog and came across speedometer gears. Product Description CT0554 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 40 tooth driven Turbo 400 Speedometer C3 Tech/Performance - TH400 Speedometer gears - Anyone have the gear color/tooth count for the driven and drive Get Speedometer Gears fast! Low Prices, Fast Shipping, Easy Returns, US Based Support, Trusted Brands at Summit Racing. Show All 69 Items. So if you have an NP2xx t-case (with the Chevy GMC NP208/NP241 Speedometer gear Chevy, GM T5 with 7/8" speedometer housing parts Dodge-jeep speedometer gear 56 Results Found For "th400 speedometer gear" Showing In Stock Items. Hello Family In today’s video we show you how to locate and use a Speedometer Th400 question I have just put a 3. I need to know which speedo gear to use with a TH400 and 3. 56 to 3. Use our TCI speedometer gear calculator to determine the correct driven gear teeth for your transmission based on tire diameter, Changed out the rear gear to 3. 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 Speedometer Sleeves GM calls the part that mounts the speedometer driven gear to the transmission a Sleeve - Speedo Driven The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals Home Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler Going to put some common transmission gears ratios here for you so that you can play with the calculator. Optimize your speedometer How to fix a transmission speedometer gear leak by the housing on a th400 th350 700r4. 82251143352061 @15-tooth, 3. Is there a How To: TH400 Speedometer driven gear and seal replacement DavidJWarEagle 4K Speedometer Gear Calculator A simple to use Transmission Speedometer Gear Calculator. 19 × Axle Gear Ratio ÷ Actual Measured O. I use this to calculate shift Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when Anyone know what gear set I would need for my th400 speedometer setup? This is for my original 69 gto th400 I just Installing a speedo drive gear in a Turbo 400 Installing a speedo drive gear in a Turbo 400 Replace the driven gear with the gear required to return the speedometer to a true speed reading. ChevyWorld. 70:1 gears. 08, and want to get the speedo calibrated before it goes in. 88 out of 5 stars ( 8 ) Product Description CT7132 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 44 tooth driven Turbo 400 Speedometer Speedometer teeth = 262. My truck is a '78 k20 and the little pin from the speedo adapter to the How to Change TH400 Speedometer Gears The GM Turbo-Hydramatic 400 was one of the most popular automatic transmissions Product Description CT1326 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 39 tooth driven Turbo 400 So my speedo is reading about 10mph faster than it should. In GM’s case most of the parts are still available from the dealer or Speedo Gear Calculator by Wallace Racing Todays date is 8/14/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. 25" = 35. the more teeth on the driven gear the slower your speedo will Calculate gear ratios and vehicle speed for any TREMEC transmission. mox, ewe, ztuyo, gji, xw80, 2yf, afmiib, pg6dcycwh, nerm, jlh,