Speedometer Drive Gear Calculator, When one value changes, the gauge . Enter tire diameter, axle ratio, and drive-gear teeth to get the driven-gear tooth count. Then take your car That's where this calculator comes in! The form on this page allows you to describe your tire size (modern radials only), wheel diameter, rear end ratio, and transmission type to calculate the The Speedometer Gear Calculator is an ingenious tool that simplifies the process of calculating your speedometer gear. Compare drive, driven, and correction gear ratios. 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 Understanding Speedometer Gears The speedometer in your vehicle works through a mechanical or electronic system that measures the rotation of your wheels and converts it to a speed reading. You can count the teeth directly, or check the transmission manufacturer's Gearing Calculator Check to see how far off your speedometer is with your new different size tires. tciauto. 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 Then we calculate the rear axle ratio. Then take your car Free speedometer gear calculator for cable-driven speedometers. The driven gear is located in a Speedometer Gear Calculator Calculate the correct speedometer drive gear teeth needed after changing tire size or rear axle ratio – globally applicable for mechanical speedometers. A higher tooth count drive gear increases speedometer reading, while a lower tooth count Use our comprehensive speedometer drive gear calculator to determine the correct drive or driven gear for your vehicle, ensuring accurate speed readings after tire, axle, or transmission changes. Depends on the accuracy of tire size diameters. Once you have the converted Speedometer Gear value from the Speedometer Gear Calculator, carry it through the rest of your calculation at full displayed precision. ) Tire Height - In The T5 Speedometer Gear Calculator helps you determine the correct speedometer gear for your T5 transmission. This will only be approximate of your corrected speed. ) Tire Height - Please use Inches when measuring Speedo Revolutions Per Mile Use our advanced speedo drive gear calculator to determine the correct speedometer driven gear for accurate speed and odometer readings after tire, axle, or transmission changes. Use the speedometer gear calculator to find the correct gear teeth and revolutions after tire size or axle ratio changes. Ok, now that you know what the variables are, how do you figure out what gears you should The Mustang Speedometer Gear Calculator is a highly specialized tool designed for Ford Mustang enthusiasts, mechanics, and owners. The drive gear is the one which is turned by engine power, usually mounted right on the transmission output shaft. Example of 700R4 Speedometer Gear Calculator Suppose a vehicle with a 700R4 transmission has a drive gear with 15 teeth, an axle ratio of 3. The THM400, TH350BOC & 700R4 uses two sizes which take care of Speedometer Sleeves GM calls the part that mounts the speedometer driven gear to the transmission a Sleeve - Speedo Driven Gear. TRANS-01, Speedometer, Gear Ratio, and Tire Size Calculator These calculations will not only help you determine your speedometer error, but will also help you determine your maximum speed in any 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. Ensure accurate speed and performance. This ensures your speedometer shows the accurate speed, avoiding To determine your speedometer error, simply calculate several "theoretical" speeds at different Engine RPMs in the same gear. Tire diameter, axle ratio, and gear teeth decide the cable speed. Click here for applications & part numbers. Export results for shop records and tuning notes A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals to ensure the accuracy of a vehicle’s speedometer. Review ideal teeth, error, and corrected road speed. Speedometer 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. Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. SUM-700321 TH-350 Speedometer Gear Kit Selec on Chart and guideline Thank you for purchasing our speedometer gear kit. Assume you own a GM vehicle and decide to upgrade Calculate the correct speedometer gear for your vehicle using Monster Transmission's tool by entering drive gear teeth, rear gear ratio, and tire height. How to calculate speedometer driven gear for correct MPH. Always recheck the speedometer calibration! You can either enter your radial tire dimensions or actual Example of GM Speedometer Gear Calculator Let’s walk through a practical example using the GM Speedometer Gear Calculator. 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 which to 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. Use RPMs that are easily readable on your tachometer. Then we show you how to obtain your tire revolutions per mile and then plug all those numbers into a simple formula to select the correct driven gear for Use our advanced speedo drive gear calculator to determine the correct speedometer driven gear for accurate speed and odometer readings after tire, axle, or transmission changes. Use our free 700R4 speedometer gear calculator to find the correct driven gear teeth for your transmission based on tire size, axle ratio, and drive gear. Calculate the correct speedometer gear size for your vehicle. com/tc/speedometermore Formula Explanation: The calculator determines the ideal driven gear teeth by multiplying the transmission's drive gear teeth by the axle ratio and the tire's revolutions per mile, then dividing by Swapping in a different gear set? This is more than likely going to throw off your speedometer. The drive gear is the one that is turned by engine power, usually mounted right on the transmission output shaft. A vehicle uses the speedometer drive gear to estimate its speed based on Instructions Drive Gear Teeth - The Number of teeth for the transmission Rear End - Rear Gear Ratio (3. This is very useful when there is no established baseline from which to work from such as replacing a The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. They consist of a small "driven" gear that meshes with a The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and customization. The THM400, TH350BOC & 700R4 uses two sizes which take care of The drive gear is the one which is turned by engine power, usually mounted right on the transmission output shaft. The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. Free calculator with preset configs. Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. To determine your speedometer error, simply calculate several "theoretical" speeds at different Engine RPMs in the same gear. Our free online calculator helps you determine the precise speedometer gear required for your vehicle. Enter tire size, axle ratio & gear set to get accurate speed readings. Q4: What if my calculated gear isn't available? A: You may need to combine different drive and driven gears to achieve the closest possible ratio. Select the speedo_calculator file and extract it to your desktop, then double-click on your desktop icon to start the calculator program. 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): A speedometer drive gear calculator is an essential tool for anyone modifying their vehicle's drivetrain. 5" and 8. Use this handy calculator to find out the speedo gear you should purchase to bring your speedometer back And the Driven Gear tab lists the driven gears used for each axle ratio, specific transmission, and tire size. Note: Drive gear refers to the gear that is on the transmission output shaft. This calculator Q4: What if my calculated gear isn't available? A: You may need to combine different drive and driven gears to achieve the closest possible ratio. Whip out your Speedometer Sleeves GM calls the part that mounts the speedometer driven gear to the transmission a Sleeve - Speedo Driven Gear. The drive gear sits on the transmission output shaft. Black 7 Tooth Speedometer Drive Gear. Ensure accurate speedometer readings. 8" axle The chart specifies the driven gear recommended to obtain approximately correct mph readings when the listed Ford Racing ring and pinion gear sets LMR Speedometer Gear Calculator Enter tire size, ratio, and drive gear. Enter drive teeth, axle ratio, and tire size to get results instantly. 08, 4. BETA RELEASE send any comments or suggestions to the email address This table provides an easy reference for common terms related to the calculator, assisting users in understanding and utilizing it effectively. These changes often lead to an inaccurate 1967 - 1973 Mercury Cougar (and Ford Mustang) Speedometer Gear Calculator Calculate the correct transmission speedometer driven gear tooth count. Speedometer Gear Calculation Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to 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 correctly. Color-coded gear chart included. Free speedometer calibration calculator for mechanical speedometers. Muncie 4-speeds originally had three different diameter speedometer drive gears. 84-inch-od 7-tooth drive gear lets you keep the existing 20-tooth driven gear and still end up with a reasonably Use the speedometer gear calculator to find the correct gear teeth and revolutions after tire size or axle ratio changes. A car's speedometer relies on a drive gear to calculate speed based on tire rotations. Find the correct driven gear teeth for your transmission after changing rear axle ratio or tire size. Edit gear ratios, or enter (and save) multiple ratio sets, then click Compare Ratios to display multiple graphs and compare. This is particularly crucial after modifications to The Speedometer Gear Calculator is designed for automotive enthusiasts and mechanics who have changed their vehicle's tire size or rear axle gear ratio. It helps determine the correct number of teeth on the drive or driven gear within your transmission to Find speedometer driven gears and other Muncie transmission parts at The Gear Box, your online store for DIY overhaul kits and accessories. It uses four main inputs: Drive gear tooth count Axle This will calculate the speedometer driven gear needed to properly calibrate your speedometer. Determine drive and driven gear teeth based on tire diameter, axle ratio, and gear specifications for accurate speedometer readings. The site that I used: http://www. Range can be 0 for single range cars, or the ratio in TCI now stocks the most popular speedometer gears. The driven gear turns the cable or sensor. The driven gear is the one which is "driven" by the "drive" gear, and is connected to the This result shows that installing a 1. 11, etc. Discover the best speedometer gear ratio for your vehicle with our Speedometer Gear Calculator. This gear fits all 4 speed Toploaders in 64-73 passenger cars except Galaxie, 64 Fairlane and Sunbeam Tiger. Check Compare and enter alternate Tire Diameter or Diff Ratio. 89, 3. Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle Speedometer gears are crucial components located inside the rear of your transmission. Introduction When you change tire sizes or axle ratios, your mechanical speedometer reads incorrectly because the driven gear tooth count no longer matches the driveshaft speed. The drive gear sits on the transmission output shaft and is visible once you remove the speedometer cable housing. Calculate the perfect drive and driven gear combination for your T5 transmission setup. Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. The driven gear is the one that is “driven” by the “drive” gear and is Calculate correct speedometer gear for tire and axle changes. Before calculating the driven-gear tooth count, the drive-gear tooth count must be determined. Restore accurate speed readings easily. They have 2 gears that work together to measure vehicle speed. Many speedometers have a given What Does a Speedometer Gear Calculator Do? A speedometer gear calculator finds the correct number of teeth for the driven gear. Return to the gear ratio calculator This form allows you to calculate tooth counts for mechanical speedometer drives. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. Determine drive and driven gear teeth based on tire diameter, axle ratio, and gear specifications. This is particularly crucial after modifications to A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals to ensure the accuracy of a vehicle’s speedometer. The driven gear is the one which is "driven" by the "drive" gear, and is connected to the 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. Free 700R4 speedometer gear calculator. Calculate the correct speedometer driven gear tooth count for your transmission after changing tire size, rear axle ratio, or drive gear teeth. Compare available gears before changing your cable setup safely. SPEEDOMETER GEAR CALCULATOR Speedometer Gear Calibrator Calculate gear ratio speedometer correction instantly. 73, and tires with a diameter of 28 Understanding Speedometer Gear Calculation The speedometer gear calculation involves determining the appropriate size of the driven gear based on the tire diameter, axle ratio, and the number of teeth What speedo gears should I buy? Speedometer Gear Selection Older vehicles use mechanical speedometers. Q5: Does this work for all transmission types? A: This Fix your Mustang speedometer accuracy. These “Speedo Instructions for Use Drive Gear Teeth - Number of teeth on the transmission side of things Rear End Ratio - Rear Gear Ratio (3. By inputting specific parameters, the tool accurately provides the necessary Speedometer Gear Ratio Calculator Calculate speedometer gearing with tire and axle changes. Ford Speedometer Chart Note: Calculated driven gears are based on normal mustang tires (815 revs/mile) and the formula listed below. We have tried to compile a gear selec on that will work for most street gear Speedometer gear uSage chart — 7. Calibrate your mechanical speedometer after swapping rear differential gears or tire sizes. Example of TCI Speedometer Gear Find the correct speedometer driven gear teeth after changing tire size or axle ratio. This calculator helps users determine the correct number of teeth for a Calculate the correct speedometer gear size for your vehicle. This speedometer gear is most commonly used on Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct driven gear. To determine which If you’re using a portal axle (Unimog, H1, aftermarket, etc) you’ll need to put your total axle gearing here, not just your differential gears. This calculator helps determine the correct speedometer drive gear based on tire size changes and axle ratio.
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