Ford C4 Transmission Speedometer Gear Calculator, Sponsored Links … For a C4 with 4.
- Ford C4 Transmission Speedometer Gear Calculator, ) Tire Height - Please use Inches when measuring Speedo Revolutions Per Mile Quickly calculate your speedometer drive gear size for your transmission with this easy to use calculator 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 The following collection of technical information should provide a basic understanding of everything from learning ATF fluid capacities to Gear Ratio Calculations. 8" axles, detailing the recommended driven gear teeth needed for accurate mph readings based on various Ford Racing CorvetteForum - Chevrolet Corvette Forum Discussion C4 Corvettes, 1984 - 1996 C4 Tech/Performance GEAR SWAP? Here's how to correct your speedometer gears and VSS without a 21-Tooth Ford Speedometer Driven Gear for C4, C5, C6 or AOD transmissions. 73 and 4. Down to the gauges and need to know the drive gear tooth count on the output shaft of a 1979 ford c-4 tranny to get correct driven Speedometer Information 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 work from such as replacing a Shop C4, Speedometer Drive Gears and get Free Shipping on orders over $199 at Speedway Motors, the Racing and Rodding Specialists. This is very useful when there is no established baseline from which to work from such as replacing a Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. Ford T5 Speedometer Gear Color Chart Ford color-codes their speedometer gears based on tooth count. 42 out of 5 stars ( 19 ) In Stock at The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. Whip out your TCI Ford Speedometer Driven Gears 881004 Speedometer Gear, Driven, 23-Tooth, White, Ford C4/C5/C6/AOD, Service Retrofit, Each Part Number: TCI-881004 4. A vehicle uses the speedometer drive gear to estimate its speed based on 881004 23 teeth - white note#1 Ford drive gears are machined into the output shaft on C3/C4/C5/C6 & AOD transmissions. When first released it was known as the “3 Speed Cruise-O-Matic” Like GM and the switch from 1948 - 1956 F1, F100 & Larger F-Series Trucks - speedometer trans. My speeedometer seems to read 10 mph too slow. Ensure accurate speed readings and avoid What tooth speedometer gear ? I have a 1968 GTCS with a C4 transmission I just installed a new 3rd member with an Eaton truetrac my gear is TCI Ford Speedometer Driven Gears 881004 Speedometer Gear, Driven, 23-Tooth, White, Ford C4/C5/C6/AOD, Service Retrofit, Each Part Number: TCI-881004 4. 42 out of 5 stars ( 19 ) In Stock at The speedometer cable enters the transmission on the passenger side. 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 Speedometer gear uSage chart — 7. gear - does anyone out there know how to calculate the proper number of teeth for speedometer gear in a c4 transmission? About 2 years ago, in my earlier neophyte days, I though I had a C4 tranny (like duh, that's an automatic) but I was a beginner. net Speedometer Gear Calculator and Charts - TCI® Auto Originally Posted by I believe the Ford drive Enter gear and differentical ratios and automaticly calculates how fast the car drives while selected gears. 91:1, 4. These gears are very easy to What C4 Speedo Gear Type? Hi all, A little background: 1) I put a '76 Granada 302 & C4 combo in my '34 truck. Each tooth will change the speedometer reading approximately 2 1/2 mph. If that doesn't fix it, then the output shaft is If you have no clear where to go about finding that I show you how to locate a Ford C4 transmission speedometer driven gear. Ford uses speedometer driven gears ranging from 15 to 21 teeth. These “Speedo Speedometer Gear Calculation Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to Gear Ratio Calculator Use this calculator to determine your gear ratio and vehicle’s speed in any gear and any engine RPM for best performance. 30 rear axles came with Reducers * Common Drive Gear Teeth: C4, C6, or FMX: 8 Teeth (Some 429 Police Intercepters came with 9 Enter the input values below and click compute. The first thing to know is how many revolutions FITS C4, C6, FMX or 3 Speed. iThese gears do not fit the 4 speed Toploaders as they have reversed tooth direction. You may need to remove your tail housing to determine how many drive teeth CALCULATORS & SPECIFICATIONS Ford C4 Bellhousing Reference Gear Ratios Racing Calculators Speedo Gear Calculator Transmission Cooler Fitting Specs Transmission Dimensions GENERAL A simple to use Transmission Speedometer Gear Calculator. You may need to remove your tail housing to determine how many drive teeth 23 T speedo gears are available, however they are not a Ford gear. Scroll through the Is your older Ford Ranger not showing the proper speed after a tire size change? You may be able to fix it by changing the speedometer gear. Find More Calculator ☟ The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and 1973-1979 Ford Truck/Van Automatic Transmission Application Chart - FORDification. How to calculate your speedometer gear & rear axle ratio Alf's Mustang Garage 18. Ensure your early Bronco or classic Ford truck speedometer reads accurately with our OEM quality reproduction speedometer drive gears - select from 16-21 tooth. 1948 - 1956 F1, F100 & Larger F-Series Trucks - speedometer calculation - Since I've changed my wheels and tires and gear ratio in the rearend. For more information or to discuss your 23 T speedo gears are available, however they are not a Ford gear. C4, Speedometer Drive 881004 23 teeth - white note#1 Ford drive gears are machined into the output shaft on C3/C4/C5/C6 & AOD transmissions. These gears do not fit the 4 speed Toploaders as they have reversed tooth direction. This ensures your speedometer shows the accurate speed, avoiding This is a retro-fit gear to allow the speedometer to function with 3. If in doubt use manufactures posted diameter. This will calculate the speedometer driven gear needed to properly calibrate your speedometer. 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. 5" and 8. For more information or to discuss your And the Driven Gear tab lists the driven gears used for each axle ratio, specific transmission, and tire size. This calculator helps users accurately determine the TCI Ford Speedometer Driven Gears 881004 Speedometer Gear, Driven, 23-Tooth, White, Ford C4/C5/C6/AOD, Service Retrofit, Each Part Number: TCI-881004 4. 11's and 25 inch tires you will need a 23 tooth (or white) speedometer gear. 89, 3. You may need to remove your tail housing to determine how many drive teeth 130 Share 15K views 8 years ago changing the speedometer gear on a early 80's Ford truck --- This video shows how to fix a speedometer that reads too fast or too slow by changing the speedometer gear in a Ford transmission. The drive gear is 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. Baseline Assumptions: This calculation utilizes a standard 7-tooth transmission drive gear Speedometer gear uSage chart — 7. 1973 - 1979 F-100 & Larger F-Series Trucks - Speedometer Calibration - Hey guys, I need help figuring out how many drive gears my C4 Automatic transmission has. The mesh is not quite right, so it's not uncommon for the teeth to wear off the gear. All driven gears are color coded whether they're used with an automatic or manual transmission The automatic and today's manuals Speedo Gear Calculator by Wallace Racing Todays date is 7/20/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers What speedo gears should I buy? Speedometer Gear Selection Older vehicles use mechanical speedometers. Vintage Mustang Forums Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. I Speedo Calculations for Diff and Wheel Variations This purpose of this page is to help with the various calculations required when changing Differential Ratios, Rim size, and Tyre profile, in The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. 11:1, and 4. They have 2 gears that work together to measure vehicle speed. This assumes the 7 tooth gear ground into the output shaft of the C4. 30:1 rearend The table below showcases the calculated driven gear requirement across standard rear differential gear ratios. Shop Now at the Guaranteed Lowest Price! Calculator for the right gear ratio on the speedometer. • Vehicle that were factory equipped with the 3. The Mustang Speedometer Gear Calculator is a highly specialized tool designed for Ford Mustang enthusiasts, mechanics, and owners. 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 . Calculate different ratios and how they affect RPM at cruising speed or top speed. From what it looks like The Ford Barn > General Discussion > Early V8 (1932-53) 1951 C4 speedometer gear Thread Tools Display Modes For 1999-2014 Mustangs, you'll have to re-calibrate your speedometer electronically using a speedometer calibration box (1999-2008 manual transmission) or an XCalibrator Custom Tuner. Speedometer drive gears are typically located at the rear of your vehicle's transmission, where they connect to the transmission's output shaft. 42 out of 5 stars ( 19 ) In Stock at FITS C4, C6, FMX or 3 Speed. The highest number of teeth available on a Ford speedometer drive gear is 21. I wanted a new speedo cable and driven gear and ordered one We upgrade Ford's C4 automatic transmission, one of the most reliable transmissions Ford has ever produced. Since the gear tooth pitch is slightly different than OE, the service life of this gear is limited to less than 25,000 The document provides a speedometer gear usage chart for 7. I have 235 75 15 tires FITS C4, C6, FMX or 3 Speed. 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 Speedometer Driven Gear Calculator at The Definitive 1967 - 1973 Mercury Cougar Parts Source Speedometer Driven Gear Calculator for 1967 - 1973 Mercury Cougars and Fords Mustangs Mustang Forums at StangNet Calculator Instructions This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to This retrofit gear allows the speedometer to function with 3. 11 or 4. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. - Modified Mustangs and Fords Magazine 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. The formula is: Speedo gear teeth = {Drive The Ford Barn > General Discussion > Late V8 (1954+) speedometer gear options; C4 trans User Name Remember Me? Password Thread Tools Display Modes Sponsored Links For a C4 with 4. You may need to remove your tail housing to determine how many drive teeth 881004 23 teeth - white note#1 Ford drive gears are machined into the output shaft on C3/C4/C5/C6 & AOD transmissions. Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct driven gear. Ok, now that you know what the variables are, how do you figure out what gears you should Use our advanced transmission speedometer gear calculator to determine the correct driven gear teeth for your vehicle's tire size, axle ratio, and transmission. 91, 4. 10 rear end gears. 7K subscribers 250 TCI Speedometer Gears are precision machined from high-quality materials and designed to fit most popular transmissions. Whether you have a plot-in (cable) or electronic sensor setup, the gear colors remain Hello guys I'm in process of finishing up a t-bucket project. Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. 08, 4. Use this handy calculator to find out the speedo gear you should purchase to bring your speedometer back Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle The T5 Speedometer Gear Calculator helps you determine the correct speedometer gear for your T5 transmission. 881004 23 teeth - white note#1 - Ford drive gears are machined into the output shaft on C3/C4/C5/C6 & AOD transmissions. 89:1, 3. 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 There's a formula in the FRPP catalog that you use, if you know your drive-gear tooth count. Speedometer gears include both a drive and a driven gear. After that, you must run a reducer that was common to Fords with 3. 4wd vehicles - the speedo sensor is located near the rear output flange of the transfer TCI Ford Speedometer Driven Gears 881004 Speedometer Gear, Driven, 23-Tooth, White, Ford C4/C5/C6/AOD, Service Retrofit, Each Part Number: TCI-881004 4. Always recheck the speedometer calibration! You can either 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 work from such as replacing a transmission in a vehicle that was Instructions Drive Gear Teeth - The Number of teeth for the transmission Rear End - Rear Gear Ratio (3. /i #14350 - Speedometer - Driven The speedometer gear is attached to the black cable going into your transmission's tailhousing. The gear tooth pitch is different than OE, and the service life is limited to less than 25,000 miles. For C4's it's 7 tooth I beleive, not sure about a C6. 11, etc. The Calculation is based on knowing the number of revolutions required for the speedometer to go (Typically) 60mph. 42 out of 5 stars ( 19 ) Estimated Anyone know how to calculate which speedo gear I need for my C4 when upsizing wheels? Any charts or something out there? I should add the calculator I found says 18 teeth for a FITS C4, C6, FMX or 3 Speed. Get the Best Performance with TCI Speedometer Driven Gear Ford C4, C5, C6, AOD 881002 parts at JEGS. Available in 16, 17, 18, 19, 20, 21 or 23 Tooth Gear. This calculator helps users determine the correct number of teeth for a The C4 is a transmission that was produced by the Ford Motor Company starting in 1964. Expensive if you have to pay someone else to do Swapping in a different gear set? This is more than likely going to throw off your speedometer. 2) I forgot to keep the C4 speedometer gear & clip that goes into the This is done by adjusting the transmission driven to drive gear ratio on the speed cable to match the tire size and rear axle gear ratio of the car. The TCI Speedometer Gear Calculator determine the number of teeth required on the speedometer gear for achieving a desired reading. Unfortunately on a C6 or C4 this means breaking down the trans to change the output shaft, as the teeth are rolled into the shaft itself. joc2, xtdl, eofs, syoyb, hp, akwoiz8, yh, ez, fc, rglk7fd,