TCI Speedo Driven Gear GM 21Teeth Red 35453SMLBK Whether is was the GT350

Whether is was the GT350 Mustang

5/8-11 in Female Thread

or together for a total of 4 feet

7/16-20 in Left Hand Thread

3/4 in Double D to 3/4 in Double D

TCI Speedo Driven Gear GM 21Teeth Red 35453SMLBK Whether is was the GT350GM 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