Performance Parts

The Speedmaster GM TH400 Transmission Billet Aluminum Full Manual Valve Body (PCE634.1006.01) is a precision-engineered replacement component designed for GM TH400 automatic transmissions. Machined...

The Speedmaster PCE634.1006.02 is a billet aluminum manual valve body designed for GM TH400 transmissions. This full manual valve body replaces the factory unit and provides direct shift control for...

The Speedmaster GM TH400 Transmission Billet Aluminum Valve Body (PCE634.1012.01) is a premium replacement component designed for GM TH400 automatic transmissions. Manufactured from billet aluminum...

The Speedmaster GM Th400 Transmission Cable Bracket and Lever (PCE217.1009) is a replacement cable bracket and lever assembly designed for GM Th400 automatic transmissions. This component manages the...

The Speedmaster PCE550.1006 is a heavy duty straight cut planetary gear assembly designed specifically for GM TH400 transmission builds. This component features a 2.10-1.40 ratio configuration and is...

This Speedmaster PCE623.1013 is a billet aluminum direct drum engineered for GM TH400 Turbo 400 transmissions. The direct drum is a critical internal transmission component that controls clutch...

The Speedmaster PCE684.1001 is a GM Turbo 400 (TH400) output shaft manufactured from 8620 steel in standard length, engineered for mechanical speedometer applications. This shaft serves as a critical...

The Speedmaster GM Turbo 400 TH400 aluminum tailhousing with roller bearing (PCE598.1006.03) is a precision-engineered replacement component designed for Turbo 400 automatic transmissions. This...

The Speedmaster PCE676.1007 is a precision-engineered billet aluminum intermediate clutch blocker eliminator plate designed specifically for GM Turbo 400 (TH400) automatic transmissions. This...

The Speedmaster GM Turbo 400 TH400 Quick Spool Valve System (PCE676.1005) is a performance-focused valve assembly designed for the legendary Turbo 400 transmission. This quick spool valve system is...

The Speedmaster GM Turbo 400 TH400 Shift Lever Kit (PCE217.1011) is designed for GM Turbo 400 and TH400 transmission applications. This shift lever kit provides the necessary components to upgrade or...

The Speedmaster PCE598.1004 is a transmission tailhousing adapter designed to convert a GM Turbo 400 (TH400) automatic transmission tailhousing to a Powerglide case configuration. This adapter...

The Speedmaster GM Turbo 700R4 Aluminum Tailhousing with Bushing (PCE598.1008.01) is a direct replacement tailhousing assembly designed for General Motors Turbo 700R4 automatic transmissions. This...

The Speedmaster GM Turbo 700R4 Aluminum Tailhousing with Needle Bearing (PCE598.1008.02) is a direct-fit replacement or upgrade tailhousing for GM 700R4 automatic transmissions. Engineered from...

The Speedmaster PCE602.1006 is a hardened input shaft designed specifically for GM Turbo Powerglide to TH400 transmission converter applications. This precision-engineered shaft features a 1.76-inch...