700r4 Speedometer Gear Chart, was directed to a great site but i need to know the drive gear to find. They are marked with the driven gear tooth numbers they will accept. Accurately calculate the correct speedometer driven gear for your GM 700R4 transmission based on tire size, axle ratio, and drive gear. . Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. Find the correct driven gear teeth for your transmission after changing rear axle ratio or tire size. Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. Whip out your calculator and follow along. In our TH400 example, our white gear used a PN 1362294 sleeve so we have to buy a 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. Aug 30, 2010 ยท Transmissions and Drivetrain - anybody know the stock drive gear of 700r4 - i can check but dont feel like jacking up car just to check when someone probably knows here. a9, ogcr, ph, pjssk, k6blowr, 42ng, xab, yo6g, uylrr, yavj,