The TCI Speedometer Drive Gear is a 21-tooth drive gear that mounts on the transmission output shaft for GM Powerglide, 200C, 375B, and 475 transmissions. The drive gear pairs with a driven gear housed in the tailhousing; the correct driven-gear tooth count depends on axle ratio and tire size.
- Type: speedometer drive gear
- Tooth count: 21
- Location: transmission output shaft
- Fits: GM Powerglide, 200C, 375B, 475
- Part number: 880003
FAQ
How many teeth does the 880003 drive gear have?
It is a 21-tooth speedometer drive gear.
Which transmissions does it fit?
It fits GM Powerglide, 200C, 375B, and 475 transmissions.
Where does the drive gear mount?
The drive gear mounts on the transmission output shaft and pairs with a driven gear in the tailhousing.

