TCI Speedo Driven Gear GM 21Teeth Red CHOPCMD 78:1) utilizes existing gear train

78:1) utilizes existing gear train (no belts or chains)

200 gph at 8 psi

GM A-Body 1966

Ends are induction heat-treated to reduce wear

TCI Speedo Driven Gear GM 21Teeth Red CHOPCMD 78:1) utilizes existing gear trainGM Powerglide 200C 375B 475 21 Tooth Speedo Drive Gear.. 21 Tooth GM Speedo Drive Gear. Speedometer gears include both the drive gear and the driven gear. The drive gear refers to the gear that is on a transmissions output shaft. The driven gear is located in a removable housing, usually in the tailhousing, of transmissions. Be aware that some transmissions will have different driven gear housings depending on the tooth count of the driven gear. TCI