Speedmaster PCE684.1001 GM Turbo 400 TH400 8620 Steel Output Shaft Standard Length Mechanical Speedo

The Speedmaster PCE684.1001 is a heavy-duty replacement output shaft designed specifically for GM Turbo 400 (TH400) automatic transmissions. Machined from 8620 steel for enhanced strength and durability, this standard-length shaft is engineered to handle the demands of high-performance and racing applications where the factory shaft may be a weak point.

Configured for mechanical speedometer setups, this output shaft is a direct-fit replacement for TH400 transmissions equipped with a mechanical speedo drive, making it a straightforward upgrade or rebuild component. Whether you're refreshing a worn transmission or building a performance unit from the ground up, the Speedmaster PCE684.1001 delivers the reliability you need.