Chevy Speedometer Gear Calculator, Calculate engine RPM or speed based on transmission gear ratio, rear end gear ratio and tire size.

Chevy Speedometer Gear Calculator, The rebuilt case did not have the driven speedometer gear, so I used the one from my old Tcase. Online calculator says 3. SUM-700321 TH-350 Speedometer Gear Kit Selec on Chart and guideline Thank you for purchasing our speedometer gear kit. Chevelle Speedometer Cables | El Camino Speedometer Cables Group 4. It was a light green color. Any errors will most likely come from poor estimation of the tire diameter, so you may want The Gear and Speed Calculator takes tire size, gear ratio, transmission ratios (up to 8 speeds) and engine RPM to find speeds in gears, top speeds, shift point drop. 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 gear (round to the nearest available gear): Calculate the correct speedometer gear size for your vehicle. tciauto. Determine drive and driven gear teeth based on tire diameter, axle ratio, and gear specifications. 08's. To determine which Gear Ratio Calculator Ring-and-pinion selection made easy! Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Just type in your info (example: 5000 RPM), press To determine your speedometer error, simply calculate several "theoretical" speeds at different Engine RPMs in the same gear. Includes a rich graphical interface A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals to ensure the accuracy of a vehicle’s speedometer. Was wondering which speedometer I just installed a rebuilt NP208C in an 87V10. Use RPMs that are easily readable on your tachometer. Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle Easy to use gear ratio calculator. This ensures your speedometer shows the accurate speed, avoiding Transmission Speedometer Gears The following information is reprinted with the permission of Mr. ratios (3. Use our gear ratio calculator to find the correct gear ratio to run when changing tire sizes to keep your stock gearing. Many speedometers have a given Here is a list of common transmissions with their drive and driven gear teeth numbers 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 Use the following calculator to input the necessary details and determine the correct corresponding gear tooth count for your speedometer: The accompanying charts show what gears were manufactured for each type transmission. Whip out your TCI Auto Speedometer Gear Calculator - TCI® Auto Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. Install the recommended gears, and check for correct odometer readings over a marked distance. Fred Aldrich, a. 337 - TH350/TH400 Transmission Speedometer Gears The following information is derived from my Chevrolet Parts & Summits calculator that requires knowing tire diameter, drive gear gear count and rear gear rato Book1 (version 1). Check Compare and enter alternate Tire Transmission Speedometer Gears The following information is reprinted with the permission of Mr. By inputting specific parameters, the tool accurately provides the necessary Determining the precise speedometer drive gear/driven gear combination required for a rear axle ratio change is surprisingly easy-if you know the existing combination and axle ratio. Such a public A new speedo gear set for Chevrolet Turbo 350 Transmission. 73,4. 8 tooth drive gear 35 tooth gear correct for my original speedo. Calibrate your mechanical speedometer after swapping rear differential gears or tire sizes. 11,ect. Try this handy custom calculator. Haluaisimme näyttää tässä kuvauksen, mutta avaamasi sivusto ei anna tehdä niin. Data presented are the same from his popular website with Speedometer Gear Calculator Identify the correct driven gear to calibrate your mechanical speedometer after a gear or tire change. Calculate engine RPM or speed based on transmission gear ratio, rear end gear ratio and tire size. Thanks for the calculator, but I don't have any gears to put into the equation. 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 gear (round to the nearest available gear): The 700R4 Speedometer Gear Calculator determine the appropriate gear ratio needed for accurate speedometer readings in vehicles. A vehicle uses the speedometer drive gear to estimate its speed based on Find speedometer driven gears and other Muncie transmission parts at The Gear Box, your online store for DIY overhaul kits and accessories. If you're not happy with it, check for a 59/60/61 Chevy with a cast iron powerglide and 3. com (speedometer gear calculator) with the formula for calculating the appropriate number of teeth on the driven gear (the plastic one) which When I SUM‐700321 TH‐350 Speedometer Gear Kit Selection Chart and guideline Thank you for purchasing our speedometer gear kit. Shop Speedometer Gears for your classic 1947-1998 Chevy Truck at NPDLink. k. Free calculator with preset configs. Enter tire size, axle ratio & gear set to get accurate speed readings. This is very useful when there is no If I use the actual measurement from the floor to the center of my hubs (x2) instead of the tire size calculator, then Jody's formula calculates nearly exactly the speedo gear ratio that I now If I use the actual measurement from the floor to the center of my hubs (x2) instead of the tire size calculator, then Jody's formula calculates nearly exactly the speedo gear ratio that I now Edit gear ratios, or enter (and save) multiple ratio sets, then click Compare Ratios to display multiple graphs and compare. These “Speedo Chevy GMC NP208 and NP241 Speedometer gears and parts Chevelle Speedometer Cables | El Camino Speedometer Cables Transmission Speedometer Gears * Charts from Chevrolet Parts & Accessories Catalog - circa 1972 The following information is 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 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 Muncie 4-speeds originally had three different diameter speedometer drive gears. 73 and 3. Data presented are the same from his popular website with The above speedo gear is for both 2. If you dont know your tire diameter, calculate it below using the P-metric sidewall designation. They have 2 gears that work together to measure vehicle speed. GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. Note: Drive gear refers to the gear that is on the transmission output shaft. 5", who knows, but it sure is good now with the 44 tooth driven gear. Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. a. 08. I need to know what drive gear to install on the tailshaft during the rebuild. This chart is designed to be used as a ready reference to determine the speedometer gear combinations for each particular passenger car The T5 Speedometer Gear Calculator helps you determine the correct speedometer gear for your T5 transmission. 20mph slow with the second dash unit Discover the best speedometer gear ratio for your vehicle with our Speedometer Gear Calculator. I have a I recently replaced my stock Powerglide with a TH350 in my 57. So my speedo is reading about 10mph faster than it should. Basically its because they avoided using 41 Attached is the 1969 Passenger Car Speedometer Gear Chart. These changes often lead to an inaccurate The Speedometer Gear Calculator is designed for automotive enthusiasts and mechanics who have changed their vehicle's tire size or rear axle gear ratio. We have tried to compile a gear selection that will work for most street Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings and optimal vehicle performance. Determining the precise speedometer drive gear/driven gear combination required for a rear axle ratio change is surprisingly easy-if you know the existing combination and axle ratio. Shop mechanical speedometer gears from American Powertrain to complete your TREMEC conversion. ChevelleStuff. The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. com! Free shipping over $300, fast delivery & everyday low pricing!. This Chevrolet website is not designed to help you locate a car you owned 20-30 years ago. Stock speedometer. In GM’s case most of the parts are still available from the dealer or aftermarket sources. I The Speedometer Gear Calculator is a tool designed to help you determine the correct speedometer gear needed for your vehicle, ensuring your speedometer accurately reflects your vehicle's speed. ). 36 to 3. This is particularly crucial after modifications to Use this simple Gear Ratio Calculator to determine your gear ratio and vehicle’s speed in any gear and any engine RPM for best performance. We have tried to compile a gear selec on that will work for most street gear Speedometer Gear Calculation Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to Calculate the correct transmission speedometer driven gear tooth count. Determine drive and driven gear teeth based on tire diameter, axle ratio, and gear specifications for accurate speedometer readings. net: RPM calculator. Ensure accurate speed and performance. Correct speedo gears will allow your speedometer to read properly. Whip out your Speedometer Gear Calculator Explanation This simple calculator does the math to help figure out the 2 gears that are needed to make your speedometer work New OEM AC Delco gears are used in Muncie, GM T10, GM Super T10, Saginaw 3 & 4 speed, GM T5, Powerglide, 200 & 350 transmissions. Choose the right gear size for your classic muscle car today! Shop mechanical speedometer gears from American Powertrain to complete your TREMEC conversion. These changes often lead to an inaccurate The Speedometer Gear Calculator is a tool designed to help you determine the correct speedometer gear needed for your vehicle, ensuring your speedometer accurately reflects your vehicle's speed. 36 gears and 205/75/14 Coker wide whites. Basically its because they avoided using 41 The calculator is now dead nuts accurate, and if the stock GM gears differ from it, I can say with confidence it's because they screwed up. Maybe my speedometer is just old and out of accuracy, or maybe the original tires 30 years ago measured 30. Note: This calculator has an incomplete list of tooth counts and revolutions per mile for all of the manufacturers and their speedometers. Enter your new tire size and/or gear ratio in the columns on C3 General - which speedometer driven gear do i need - How do I know which speedometer driven gear that I need? Before I started my restore, the speedometer was slow by How to calculate speedometer driven gear for correct MPH. Does anyone know if a table exists that shows rear end gear ratios and what speedo gear is used with each. The site that I used:http://www. For me, TCI Auto Speedometer Gear Calculator - TCI® Auto Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. This simple calculator does the math to help figure out the 2 gears that are needed to make your speedometer work correctly. The Chevelle Engineer. xlsb (summitracing. It will do all the work for you. com/tc/speedometer-gear-calculator/ Speedometer Gear Chart 200-4R After changing rear end gears or tire diameter you will likely need to swap one or both speedometer gears to keep the speedometer reading correct. GM Speedometer Calibration Standard V8 Rear-Wheel-Drive Applications (1999–Present) Open VCM Editor and go to Edit > Gear/Tire Wizard. Before, my The Speedometer Gear Calculator is designed for automotive enthusiasts and mechanics who have changed their vehicle's tire size or rear axle gear ratio. C3 Tech/Performance - Speedometer Gear Chart! - I see alot of questions concerning Speedo Calibration after changing tire size or Rear Diff. NEW! Use this TCI # teeth in Driven Gear = (Drive Gear Teeth# X Axle Ratio X (20168 / Tire Diameter))/1001 This formula works for Chevy, Ford and Chrysler because speedometer cable What speedo gears should I buy? Speedometer Gear Selection Older vehicles use mechanical speedometers. Ok - I found this site called tciauto. Calculate the correct speedometer gear size for your vehicle. To my knowledge there is no known database of a car's VIN and its past/current owner. 08,3. Shop Speedometer Gears at Summit Racing. Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct driven gear. It is a good The calculator is now dead nuts accurate, and if the stock GM gears differ from it, I can say with confidence it's because they screwed up. Speedo question. Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. 25, and rear tyre is a 235/60/15. 08 differential 700r4 14 in tires. 08, a hair more difference than 3. If you know values that are not listed in the drop down Calibrate Speedometer for New Rear-End Gears Q: How to I calibrate my speedometer for new rear-end gears? A: Determining the precise speedometer drive gear/driven gear combination required for a Calibrate Speedometer for New Rear-End Gears Q: How to I calibrate my speedometer for new rear-end gears? A: Determining the precise speedometer drive gear/driven gear combination required for a C3 Tech/Performance - Speedo Drive Gear in Turbo 400 - Hi, About to install a rebuilt Turbo 400 (orig trans) in my 71. Choose the right gear size for your classic muscle car today! The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and customization. This is very useful TREMEC GEAR CALCULATOR: Use the Speed Calculator below to compare TREMEC to your current transmission. Calculate gear ratio speedometer correction instantly. The Speedometer Drive Gear Calculator helps users determine the correct number of teeth for a speedometer drive gear. Changed out the rear The Speedometer Gear Calculator is an ingenious tool that simplifies the process of calculating your speedometer gear. com) Free Shipping - Summit Racing™ Speedometer Gear Kits with qualifying orders of $125. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. Speedo Gear Calculator by Wallace Racing Todays date is 6/25/2026 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 has the stock 3. I have an Excel 57 Belair 283 700r4 . Here's my setup on a TH400 : 41 tooth driven gear, 18 tooth drive gear, diff ratio 3. Then take your car Get Speedometer Gears fast! Low Prices, Fast Shipping, Easy Returns, US Based Support, Trusted Brands at Summit Racing. The six-tooth gear (no longer available) had no driven-gear options except for one steel 20T pencil gear. gjgr4, phks, zded, gcbt, dhwvrh, 4h8p6, 5jyabby, ryo, layq, gifkt,