Speedmaster TH400 Turbo 400 Transmission Billet Aluminum Direct Drum with Piston and XLarge Sprag

The Speedmaster TH400 Turbo 400 Transmission Billet Aluminum Direct Drum is a precision-machined component designed for high-performance transmission builds and rebuilds. This direct drum assembly features billet aluminum construction paired with a piston and XLarge sprag configuration, making it suitable for applications requiring durability and reliability in competitive or heavy-duty driving environments.

The billet aluminum design provides strength and weight savings compared to cast alternatives, while the XLarge sprag sizing accommodates higher-torque applications. This drum assembly is commonly used by transmission specialists, performance builders, and enthusiasts working on TH400 transmissions where upgraded or replacement components are needed. Proper installation requires transmission expertise and should be paired with compatible internal components to ensure optimal performance and longevity.

Key Features & Benefits

• Billet Aluminum Construction: Precision-machined billet aluminum material provides strength and durability for high-performance transmission applications.
• Direct Drum Design: Direct drum configuration supports efficient power delivery and torque handling in TH400 transmission systems.
• XLarge Sprag Sizing: Oversized sprag geometry accommodates elevated torque loads and performance-oriented builds.
• Includes Piston Assembly: Complete with piston component for ready integration into transmission rebuild kits.

Specifications

Ideal Applications

• High-performance transmission rebuilds and upgrades
• Heavy-duty or competition driving transmission assemblies
• TH400 transmission shops and specialty builders
• Custom transmission performance modifications