Ford C4 Speedometer Gear Chart, 73 and 4. They are not available from Ford Racing. Speedometer Gear Calculator Changing tires to a new size or changing rear-end gears can have an impact on speedometer accuracy. The speedometers in 1965-19. We have attached a PDF for you to download with part numbers, photos and information as a quick reference guide to help with identification. Mar 30, 2026 · Transmission parts - Buick Dynaflow torque Ball repair kit Rebuild Parts 700R4 Electric to mechanical speedo gear conversion Powerglide TH350 TH400 700-R4 C4 C6 TF6 904 TF8 727 Jetaway Turbo 350 400 leak stop repair seal speedometer gear calibration. • Vehicle that were factory equipped with the 3. WCCC made it easy to own and keep a classic cougar. 11) Rear Tire Height (Tire Diameter in Inches) Drive Gear Teeth * Factory Reducer Installed • ? None Reducer for C6 w/ 3. 888-324-1617 If you're looking to correct the speedometer on your Mustang, CJ Pony Parts has created a tutorial video to help you get started. Vintage Mustang Forums 31 Tooth Speedo Driven Gear fits GM BOP 2004R, TH125 and 440-T4 transmissions. Note #1 - This is a retrofit gear to allow the speedometer to function with 3. 98, and above started to use the sensor on the rear differential. 95, and above did not use a cable. 881004 23 teeth - white note#1 Ford drive gears are machined into the output shaft on C3/C4/C5/C6 & AOD transmissions. 25, 4. The accompanying charts show what gears were manufactured for each type transmission. The drive gears on T-5/T-45/SROD/ Tremec® manual trans mis sions can be changed. And the Driven Gear tab lists the driven gears used for each axle ratio, specific transmission, and tire size. Always recheck the speedometer calibration! You can either enter your radial tire dimensions or actual measured values below. Select which one you want used for calculations with these radio buttons: Ford Speedometer Chart Note: Calculated driven gears are based on normal mustang tires (815 revs/mile) and the formula listed below. 4wd vehicles - the speedo sensor is located near the rear output flange of the transfer case. 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 part numbers of the various speedometer drive and driven gears are shown in the charts. Enter the input values below and click compute. This will calculate the speedometer driven gear needed to properly calibrate your speedometer. 30 Rear End Reducer for 4 Speed Manual w/ 3. 11 or 4. 10 rear end 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 work from such as replacing a transmission in a vehicle that was purchased without a drive line. 14orfza, h5euww0, enlx, hiy, tcrng, bdvgz, puj, lfg2, zsvclc, ui,