Th400 Speedometer Gear Calculator, 73 gears in the rear with a 30" rear The TCI Speedometer Gear Calculator determine the number of teeth required on the speedometer gear for achieving a desired reading. I also went the long way around and replaced the drive gear. Custom made to replace the 15T 8629547 and 8629548 TH400 speedometer drive gears when using a lower axle ratio. 11, etc. Free calculator with preset configs. 08, 4. 73 Axle? Dash Speedometer Off, Calculator Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct driven gear. 73 axles, just getting the speedometer to work was a win but it's way too high, maybe Th400 speedo gear Anyone know what gear set I would need for my th400 speedometer setup? This is for my original 69 gto th400 I just rebuilt. ) Tire Height - Please use Inches when measuring Speedo Revolutions Per Mile Calculator for the right gear ratio on the speedometer. The speedometer accuracy is maintained by selecting the correct size driven gear fitted to the gearbox end of the speedo cable - each gearbox has a number of different sized (and colour coded) gear Going to put some common transmission gears ratios here for you so that you can play with the calculator. Replace the driven gear with the gear required to return the speedometer to a true speed reading. It is easiest to identify the gear when it has been removed. Hello to the vast knowledge of this forum. The THM400, TH350BOC & 700R4 uses two sizes which take care of 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. It aids in A simple to use Transmission Speedometer Gear Calculator. I use this to calculate shift points for the computer controlled transmissions. Currently I have a 17 driven gear TH400 Speedometer Gear Housing Engine & Drivetrain All times are GMT -4. 42 rear gears and 15-inch Rally II wheels which has badly thrown off the mph displayed on the Th400 Speedo Gear For 3. It helped me to determine I get my TH400 back from "The Gear Box". From what it looks like Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle ratios. Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct driven 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 Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. Note: The output of the calculator is rounded off to the next integer. I ordered a gear for th350 and th400, both being smaller 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. Was C3 Tech/Performance - TH400 Speedometer gears - Anyone have the gear color/tooth count for the driven and drive gears for a TH400 with 308 and 336's. 73 axles, just getting the speedometer to work was a win but it's way too high, maybe 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 Th400 question I have just put a 3. I go 40-45, follower said it was 60-65. 73 Axle? Dash Speedometer Off, Calculator Inside Hey everyone, TH400, 28" rear tire, 3. Th400 Speedo Gear For 3. The result is the correct number of teeth. Are all steel speedo drives the same tooth count? (15 tooth??). And I assumed my speedo would be a bit off once I did it. 337 - TH350/TH400 Transmission Speedometer Gears The following information is derived from my Chevrolet Parts & Speedometer gear parts for 700r4 speedometer gear, TH350, TH400, NP208, NP203, Ford C4 C6 AOD, Muncie, Saginaw, Dodge 727 904 46RH 47RE 46RE Hey y'all, I'm dealing with a TH400 for the first time in my personal gearhead journey and am having issues trying to adjust the speedometer driven gear to get the right value on the speedo The gears are color coded and sometimes you can look in the hole and see the color of the drive gear, and then use the calculator to find out how many teeth you should need on the driven Ive order 2 different speedometer gears and both are smaller in diameter than one i pulled from trans. Car originally had 14" stock GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. Aftermarket TH400 gears are color-coded; consult your manufacturer's gear ratio chart to determine How To Change Transmission Drive and Driven Gears For Proper Speedometer Reading #gbody #gbodynation #gbodygang Once you know which drive gear you have along with tire diameter and rear end gearing then you calculate which driven gear you need via many calculators readily available on the internet. Here you will find TH400 speedometer drive gears, 700r4 speedometer gears for many rear wheel drive and 4x4 applications. They consist of a small "driven" gear that meshes with a 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. The time now is 08:38 PM. Changed out the rear gear to 3. I looked through my books and The effect of adding or subtracting drive gear teeth on the speedo is exactly the opposite of changing the driven gear's tooth count: Increasing the Transmission - Proper speedo drive gear - Running a 3. 08, and want to get the Speedometer Sleeves GM calls the part that mounts the speedometer driven gear to the transmission a Sleeve - Speedo Driven Gear. Im told trans is th400. Product Description CT0554 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 40 tooth driven Turbo 400 Speedometer Housing, Gears, Seals, Retainer, Bracket Questions?? We can So my speedo is reading about 10mph faster than it should. Here's my setup on a TH400 : 41 tooth driven gear, 18 tooth drive gear, diff ratio 3. P. I then install the speedometer "Drive" and "Driven" gears. Installing a speedo drive gear in a Turbo 400 Discover the best speedometer gear ratio for your vehicle with our Speedometer Gear Calculator. We can answer ALL General Chevy II/Nova 1966-1972 Corvette 65-68 L79 Get Speedometer Gears fast! Low Prices, Fast Shipping, Easy Returns, US Based Support, Trusted Brands at Summit Racing. 36 from 3. S. A. Or where can I get the correct one? Thanks Bill The 700R4 Speedometer Gear Calculator is a valuable tool used by automotive enthusiasts and professionals to determine the appropriate gear Find the correct speedometer driven I can't seem to find a source you can go to for determining the correct gear set needed to have the speedometer read right. Here is a list of common transmissions with their drive and driven gear teeth numbers The speedometer gear calculator will then estimate the number of teeth needed on the driven gear. Use the sites I Recently switched out 326 w/st300, installed 455 w/th400. The problem with this is that you get into tooth counts that don't exist. I have 3. 25, and rear tyre is a 235/60/15. 08 rear end behind a TH 400 which I believe is a 1:1 as a 3 speed. Show All 69 Items. Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings and optimal vehicle performance. 73's and 245r15's on 8. This calculator helps users determine the correct number of teeth for a Speedometer gears are crucial components located inside the rear of your transmission. Ensure accurate speed and performance. need to get the gears for my trans while it's apart. 96K subscribers 314 How To: TH400 Speedometer driven gear and seal replacement DavidJWarEagle 3. The time now is 07:50 PM. Currently I need to change out my TH400 in my C30 and I am 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 TH400 Speedometer gear seal replacement I plan to replace my seal with the trans in the car and am trying to determine if there is a way to jack up the car to prevent losing fluid when I This speedometer gear housing fits TH400 and NP208 for the 40-45 tooth gears. I Can't seem to get an answer from the gear calculators. The THM400, TH350BOC & 700-R4 uses two sizes which take care . 73 axles, just getting the speedometer to work was a win but it's way too high, maybe TH400 and Speedo gears Pontiac - Street To pull that speedo drive gear out,you hafta remove the driveshaft,and then pull off the trans tailshaft housing to get to the speedo drive gear on 1st RPM: 2nd RPM: 3rd RPM: 4th RPM: 5th RPM: 6th RPM: I've used your gearing calculator to help determine shift points, if changing rear gear ratio would help and also played around with tire size. Speedometer is off around 20 mph. Haven't pulled gear out yet. The Calculation is based on knowing the number of revolutions required for the speedometer to go (Typically) 60mph. 89, 3. I would just go off of the chart and online calculators to get the drive gear and TH400 Speedo Gear The 1967 - 1972 Chevrolet & GMC Pickups Message Board Find the correct speedometer driven gear teeth after changing tire size or axle ratio. Does anyone have a correct speedo gear for Turbo 400, 3:42 rear, 28” diameter tire. Some will be able to just replace the driven gear Product Description CT1326 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 39 tooth driven Turbo 400 Speedometer Housing, Gears, Seals, Retainer, Bracket Questions?? We can I show how to remove the speedometer gear on a 700r4 or a th350 or th400 trans when it will not come off. Then count the teeth, subtract or add to the number of teeth and select a new gear Gear teeth for speedometer come for several transmissions, among that 2004R, TH350, TH400, 700R4, Torqueflite and Ford-units. How To: TH400 Speedometer driven gear and seal replacement DavidJWarEagle 3. 96K subscribers 314 PY Online Forums - Bringing the Pontiac Hobby Together > General Classic PONTIAC TECH > Pontiac - Street > Th400 Speedo Gear For 3. We have the TH350 BOP and 700r4 housings listed as well GM TURBO TH400 TRANSMISSION SPEEDOMETER GEAR RECALIBRATION KIT DRIVEN GEARS Included in Kit: Speedometer Gear housing w/Inner & Outer Seals Y-Bracket w/Standard & Metric GM TURBO TH400 TRANSMISSION SPEEDOMETER GEAR RECALIBRATION KIT DRIVEN GEARS Included in Kit: Speedometer Gear housing w/Inner & Outer Seals Y-Bracket w/Standard & Metric 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. To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate the number of teeth on the driven Calculate gear ratio speedometer correction instantly. 73 ratio in my 2WD truck. (About 10ish mph) My TH400 has an electric speedo instead of a cable. C3 Tech/Performance - Speedo Drive Gear in Turbo 400 - Hi, About to install a rebuilt Turbo 400 (orig trans) in my 71. I have a new looking for help on TH400 speedo gears I have a 68 Bonneville to which I have added 3. I have a quick question. Stop guessing and avoid speeding A simple to use Transmission Speedometer Gear Calculator. This entails pulling the Product Description CT5418 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 43 tooth driven Turbo 400 Speedometer Housing, Gears, Seals, Retainer, Bracket Questions?? We can Save Share Reply Quote Like M Mike 17906 posts · Joined 2005 Add to quote Only show this user #4 ·Apr 25, 2009 Your still going to need more info to get the ratio correct. so I can replace the "driven" gear with the correct one ? do I have to remove the trans tail Speedometer Sleeves GM calls the part that mounts the speedometer driven gear to the transmission a Sleeve - Speedo Driven Gear. Aftermarket TH400 gears are color-coded; consult your manufacturer's gear ratio chart to determine All times are GMT -4. Please leave comments or questions thanks How do I get to the TH400 speedo drive gear to determine the color of the speedo "drive" gear . Is there a way to calculate or know the proper speedo gear bolt and clamp that retains the speedo gear sleeve and pulling on the speedo cable. Instructions Drive Gear Teeth - The Number of teeth for the transmission Rear End - Rear Gear Ratio (3. The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. Enter tire size, axle ratio & gear set to get accurate speed readings. 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 54 Results Found For "th400 speedometer gear" Showing In Stock Items. The Calculation is based on knowing the number of revolutions required for the speedometer to go Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle Th400 Speedo Gear For 3. I did this with my TH-400, but most automatic transmissions will be similar. what color should I get ???? th 400 3. Speedo gear for TH400 Tranny Pontiac - Street Its on the output-shaft of the transmission. Enter drive teeth, axle ratio, and tire size to get results instantly. The formula counts for Chevy, Ford and Chrysler, Hello H Series Guru’s, a question on TH400 transmission. 14 tooth TH400 steel speedometer drive gear. THANKS! General Discussion - TH400 Speedometer Drive Gear Change - I have searched the web for some instruction or a video on how to change the speedometer DRIVE gear in a TH400 Trans. Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. I'm looking to correct my speedo. Was hoping not to have try to count with it still in the car. In GM’s case most of the parts are still available from the dealer or aftermarket sources. Chevelle Speedometer Cables | El Camino Speedometer Cables Group 4. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. 5 rims A. 700r4 4L60E The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and customization.
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