Automatic Transmission Speedometer Driven Gear – GM (3987918)

Automatic Transmission Speedometer Driven Gear is a toothed component that transfers drive through a set ratio. Tooth count, pressure angle and hub offset are what make one gear interchangeable and another not.

Replace the Speedometer Driven Gear when you find chipped or spalled teeth, when the pattern shows contact concentrated at one end, or when the transmission is apart for another failure. Inspect the mating gear before refitting.

This Speedometer Driven Gear is listed as part 3987918 (Gears & Internal Parts). Where a number has been superseded, the current reference is the one that ships, so check any supersession note before ordering.

Genuine GM part for the Speedometer Driven Gear. Where the manufacturer has superseded a number, the current reference is the one that ships.