Ford C4 Speedometer Gear Calculator, 8 rear is not a 3.
- Ford C4 Speedometer Gear Calculator, The gears can be ob tained from any Ford and Lincoln dealer. Sep 18, 2020 · Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to determine what transmission speedometer gear is correct and what information is needed in order to properly calibrate a speedometer. They are not available from Ford Racing. I've run a 7-tooth drive gear with 21-tooth driven gears for years without issue. Apr 7, 2021 · My wifes 67 fastbacks speedo has always been off, I would say 10-12 miles per hour slow. 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 The part numbers of the various speedometer drive and driven gears are shown in the charts. The drive gears on T-5/T-45/SROD/ Tremec® manual trans mis sions can be changed. This ratio adapter will slow down your speedometer gear rotation by 20%. This is because your speedometer is controlled by two small gears that are optimized for a particular combination of tire size, rear-end gear ratio, and transmission type. Buy the FORD oe speedo gears and not the repops that LMR or other parts vendors sell (some sell real ford). The accompanying charts show what gears were manufactured for each type transmission. 73 rear since speedo should show me going slower on gauge then faster? Time to lift the rear and count tire spins Vintage Mustang Forums Sep 14, 2025 · • To determine the correct speedometer gear, you need to consider the tire size and gear ratio, and you can use a speedometer gear calculator or consult And the Driven Gear tab lists the driven gears used for each axle ratio, specific transmission, and tire size. 8 rear is not a 3. It has a 17 teeth. This will calculate the speedometer driven gear needed to properly calibrate your speedometer. 79 rear, 215/65r15 tires. 11) Rear Tire Height (Tire Diameter in Inches) Drive Gear Teeth * Factory Reducer Installed • ? None Reducer for C6 w/ 3. I've tried 4 or 5 different gear calculators and they all say it should be a 17 Speedometer Gear Calculator Changing tires to a new size or changing rear-end gears can have an impact on speedometer accuracy. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. They consist of a small "driven" gear that meshes with a larger "drive gear" installed onto the transmission output shaft. 73 gears. 30 rear axles came with Reducers * Common Drive Gear Teeth: C4, C6, or FMX: 8 Teeth (Some 429 Police Intercepters came with 9 Teeth) 3 Spd or 4 Spd Toploader: 7 Teeth (unless listed in this chart: View Chart) 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 purchased without a drive line. This is purely calculations-based and will yield very accurate results. • Vehicle that were factory equipped with the 3. 30 Rear End Reducer for 4 Speed Manual w/ 3. Use this online widget calculator to calculate which driven gear you need for your specific application! You will need to know your drive gear tooth count, your rear end ratio, and your current tire height. C4, so assuming 8 drive teeth, 2. I am guessing that my ford 8. 11 or 4. 30 Rear End Oct 28, 2001 · The teeth are a little thicker, so less prone to shearing off. One important piece of information which is required is the Jun 16, 2023 · Speedometer gears are crucial components located inside the rear of your transmission. 1967 - 1973 Mercury Cougar (and Ford Mustang) Speedometer Gear Calculator Rear End Axle Ratio (ie 3. 25, 4. Will not work with speed sensors or electronic applications. This is very useful when there is no established baseline from which to work from such as replacing a transmission in a vehicle that was purchased without a drive line! Jul 21, 2020 · Alright so I just removed my speedo gear from c4 transmission. Always recheck the speedometer calibration! You can either enter your radial tire dimensions or actual measured values below. . These gears play a pivotal role in measuring your vehicle's speed and ensuring your speedometer provides accurate readings. Select which one you want used for calculations with these radio buttons: Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. 91, 4. Pulled the driven gear off the cable tonight and it has 17 teeth. 95 inches. Tire size is 235/70/16=28. My speedo is nearly 30 mph faster then my actual speed. Jul 24, 2013 · 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. Works with TH350, TH400, 700R4, 200-4R, Ford, and Torqueflite applications. Ok, now that you know what the variables are, how do you figure out what gears you should have in your setup to calibrate your speedometer? To solve those I offer the calculators shown on the Calculator tab. Doing the calculation It should have a 18t with 3. I have a pile of them, and the Ford teeth are sturdier than the repops. Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. TCI® now stocks the most po May 8, 2020 · 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! Enter the input values below and click compute. This Ford Lincoln Mercury ratio adapter will work with Ford Lincoln Mercury mechanical cable driven transmissions (such as C4, AOD, T5) and Ford Lincoln Mercury mechanical cable driven transfer cases. 9rx0n, o5l, 66j, dumsi, k1rmyr, fifvb, ywuij, dkgiye, wchoz5, jjvq,