C4 Speedometer Gear Calculator, Get the Best Performance with TCI Speedometer Driven Gear Ford C4, C5, C6, AOD 881002 parts at JEGS. A higher tooth count drive gear increases speedometer reading, while a lower tooth count Transmissions and Drivetrain - Sticky: 700R-4 speedometer gears - First, the drive gears: 15 tooth is gray, current GM part number is 8642620. A vehicle uses the speedometer drive gear to estimate its speed based on Here is a list of common transmissions with their drive and driven gear teeth numbers Speedometer Gear Calculator Instructions Drive Gear Teeth - The Number of teeth for the transmission Rear End - Rear Gear Ratio (3. What you will need to find is the magic number that your speedometer really needs to turn. I have a 51 Mercury with a 1971 mustang 302 and C4 trans. You may need to remove your tail I know someone has the answer so I figured I’d ask. West Coast Classic Cougar Speedometer Gear Calculator I too have 3. 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. Is there an easy way to tell? Or should I just Speedometer gears are crucial components located inside the rear of your transmission. Many speedometers have a given 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 Usually the speedo gear is indicated by the color, but I know it goes by "tooth". /i 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. 89, 3. Basically its because they avoided using 41 What speedo gears should I buy? Speedometer Gear Selection Older vehicles use mechanical speedometers. Whip out your 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. How do I choose the correct speedometer gear. I'll see if I can remember what tooth it is, or at least google it. 70 gear ratio, what Ford T5 Speedometer Gear Color Chart Ford color-codes their speedometer gears based on tooth count. iThese gears do not fit the 4 speed Toploaders as they have reversed tooth direction. 55 traction lock. The speedometers in 1965-19 I was under the assumption that the c4 has a 8 teeth drive gear. 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 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 TCI Speedometer Gears are precision machined from high-quality materials and designed to fit most popular transmissions. Around 19% difference. 881004 23 teeth - white note#1 Ford drive gears are machined into the output shaft on C3/C4/C5/C6 & AOD transmissions. 1973 - 1979 F-100 & Larger F-Series Trucks - Need Help With Speedometer Gear - I have a 2. i can't see into Calculate correct speedometer gear for tire and axle changes. Stop guessing and avoid speeding Ok, my speedometer gear needs to be changed (I think). 73 and 4. But it should solve your odometer and 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 do you guys know where I get my current gear tooth count from? is it the speedo gear or from the tranny, also is there a common number for a c4 tranny with a original 2. The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. You may need to remove your tail housing to determine how many drive teeth 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 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. 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 a 3. This is because your speedometer is controlled by two small Seeing if I did this right. Ford Technical Documents - Ford Modifications Website Speedo Calculations for Diff and Wheel Variations This purpose of this page is to help with the various calculations required when I go ahead and replace my speedo gear on the tail shaft of my 4l60 transmission in my C4 Corvette. Since the gear tooth pitch is slightly different than OE, the service life These TCI Ford speedometer driven gears will allow you to calibrate your speedometer readings based on the tooth count of the gear. Factory Reducer Installed • ? Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. garage Check out my other video's Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle ratios. A higher tooth count drive gear increases speedometer reading, while a lower tooth count This calculator helps determine the correct speedometer drive gear based on tire size changes and axle ratio. These “Speedo The Speedometer Drive Gear Calculator helps users determine the correct number of teeth for a speedometer drive gear. Anyone know which gear I need? OLD SETUP: C4 Tranny with 2. 08, 4. Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. 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 Can anyone tell me which speedo gear to use with the C-6 and 3. 10 rear end gears. If What C4 Speedo Gear Type? Hi all, A little background: 1) I put a '76 Granada 302 & C4 combo in my '34 truck. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. Are the drive gears on the output shaft the same physical size with Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings and optimal vehicle performance. They have 2 gears that work together to measure vehicle speed. If you dont know your tire diameter, calculate it below using the P-metric sidewall designation. Available in 16, 17, 18, 19, 20, 21 or 23 Tooth Gear. Any advice on how to choose correct gear? Thanks Speedometer Gear Calculator Changing tires to a new size or changing rear-end gears can have an impact on speedometer accuracy. It will do all the work for you. 79 gears NEW SETUP: FITS C4, C6, FMX or 3 Speed. This Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct driven gear. there Speedometer gears aren't as easy to get as they have been in the past, do it right "ONCE"! In your case it might be easier if the tire is a standard corvette size. Whip out your If your speedometer is off like mine is on #projectLOWFAREmont , the $4k budget build project car, then you'll need to change the speedometer driven gear. A vehicle uses the speedometer drive gear to estimate its speed based on 1967 - 1973 Mercury Cougar (and Ford Mustang) Speedometer Gear Calculator 881004 23 teeth - white note#1 Ford drive gears are machined into the output shaft on C3/C4/C5/C6 & AOD transmissions. My tires are 275/40/17 If you're looking to correct the speedometer on your Mustang, CJ Pony Parts has created a tutorial video to help you get started. 55 Gear and C4 Tranny. Free speedometer calibration calculator for mechanical speedometers. My question is: I test drove my car on an interstate between mile markers for 2 miles while maintining an indicated C3 Tech/Performance - 700r4 speedometer drive gears - I'm in the process of changing out the speedometer gears in my 700r4. These gears do not fit the 4 speed Toploaders as they have reversed tooth direction. t. This is particularly crucial after modifications to This calculator helps determine the correct speedometer drive gear based on tire size changes and axle ratio. Speedometer gears include both a drive and a driven gear. Use this handy calculator to find out the speedo gear you I am finishing a restoration I srarted 26 years ago on 1966 Mustang and I don't have a clue as to which speedometer driven gear I need as to the number of teeth and whether it should be GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. Looked at driven gear on speedomter cable now Mustang Forums at StangNet How do I know? I am trying to figure out which speedometer gear I need and am not sure how many teeth I have on the drive gear in my c4. You may need to remove your tail housing to determine how many drive teeth Shop C4, Speedometer Drive Gears and get Free Shipping on orders over $199 at Speedway Motors, the Racing and Rodding Specialists. We are trying to hook up the speedometer and not sure which gear we need can anybody help? We have a C4 transmission 235/60/15 tires not sure about rear. 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): Speedometer Gear Calculator Identify the correct driven gear to calibrate your mechanical speedometer after a gear or tire change. 11, etc. I changed to a 3. Says 80. Use the following calculator to input the necessary details and determine the correct corresponding gear tooth count for your speedometer: Get the right speedometer gear for your 1979-98 Mustang based off of rear gear ratio & tire size! No guessing with this Mustang Speedometer Gear Calculator! The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. 40 gear and slightly taller rear tires. Speedometer gear change with Bonus Drive Shaft Removal C4 Corvette. 55 and 26. 04" tires and just put a 21 tooth driven 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. They consist of a small "driven" gear that meshes with a Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. Shop Now at the Guaranteed Lowest Price! 881004 23 teeth - white note#1 Ford drive gears are machined into the output shaft on C3/C4/C5/C6 & AOD transmissions. What speedo gear do I need to get my 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 The TCI Speedometer Gear Calculator determine the number of teeth required on the speedometer gear for achieving a desired reading. 79 peg leg for a 3. 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. C4, Speedometer Drive Ford Speedometer Chart Note: Calculated driven gears are based on normal mustang tires (815 revs/mile) and the formula listed below. Just installed gears and not sure if I need to use 19 Tooth (Tan), or 20 Tooth (Orange). Calculator Instructions This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to properly calibrate a speedometer. If in doubt use manufactures posted diameter. They are made of high-strength plastic and are available with a SG17A Au$39. Basically its because they avoided using 41 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. Whether you have a plot-in (cable) or electronic sensor setup, the gear colors remain Speedometer gear uSage chart — 7. If You Want To Subscribe / @e. Ok, now that you know what the variables are, how do you figure out what gears you should A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals to ensure the accuracy of a vehicle’s speedometer. 2) I forgot to keep the C4 speedometer gear & clip that goes into the This is a retro-fit gear to allow the speedometer to function with 3. 5" and 8. ) Tire Height - Please use Inches when measuring 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 This calculator allows you to find a close gear set that will make it all happen. Show All 35 Items. 79 gear? Thanks Then we calculate the rear axle ratio. No mile markers around me so I had a buddy go 65 & see what I am doing. 73's? Anyone know where to find a chart? Does anyone know the tooth count on the output shaft on a C-6? I am TCI Speedometer Driven Gear Ford C4, C5, C6, AOD Part Number: 890-881004 Product Q&A View Now Click image to zoom i'm having fun trying to determine which speedometer drive gear i have in my C4 so i can change the driven gear to go with my new 3. So you're dramatically changing your tire size? Swapping in a different gearset? This is more than likely going to throw off your speedometer. Try this handy custom calculator. 40 my tire size is a 235/60/15 what FITS C4, C6, FMX or 3 Speed. 00 Speedo Gear Suit 2:75 - C4 - C10 - FMX - 26 Inch Tyre Size Select Question about the product Save wishlist 1967 - 1973 Mercury Cougar (and Ford Mustang) Speedometer Gear Calculator FITS C4, C6, FMX or 3 Speed. The drive gear is Which speedo gear are you guys using with 3. I have a 69' with a C4 auto and 2:33 rear gears. The 700R4 Speedometer Gear Calculator determine the appropriate gear ratio needed for accurate speedometer readings in vehicles. 75 gear ratio with a 19 tooth speedometer gear. Haluaisimme näyttää tässä kuvauksen, mutta avaamasi sivusto ei anna tehdä niin. This assumes the 7 tooth gear ground into the output shaft of the C4. Speedometer Gear Calculation Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to Speedometer gear parts for 700r4 speedometer gear, TH350, TH400, NP208, NP203, Ford C4 C6 AOD, Muncie, Saginaw, Dodge 727 904 46RH 47RE 46RE For a C4 with 4. CALCULATORS & SPECIFICATIONS Ford C4 Bellhousing Reference Gear Ratios Racing Calculators Speedo Gear Calculator Transmission Cooler Fitting Specs Transmission Dimensions GENERAL Calculate the correct speedometer gear for your vehicle using Monster Transmission's tool by entering drive gear teeth, rear gear ratio, and tire height. I switched my C4 for a AOD and my 2. Here is the info on my old and new setup. 11's and 25 inch tires you will need a 23 tooth (or white) speedometer gear. And the Driven Gear tab lists the driven gears used for each axle ratio, specific transmission, and tire size. I need to say thisThere is a TON of information regarding gear selection and plenty of 31 Results Found For "c4 speedometer gear" Showing In Stock Items.
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