ALUMINUM DIRECT DRUM (7075 BILLET) ASSY. W/SUPER SPRAG, 5 CLUTCH INTERMEDIATE (INCLUDES COA-22230 & COA-22818A)

The Coan Racing COA‑22815 Aluminum Direct Drum Assembly is a high-performance upgrade engineered specifically for Turbo Hydramatic 400 transmissions. Machined from 7075 billet aluminum in the USA, this direct drum assembly combines the benefits of lightweight design with race-ready strength. The unit features a 36-element Super Sprag and a robust 5-clutch intermediate pack, delivering exceptional one-way clutch engagement and torque capacity essential for drag and bracket racing applications. It includes precision-machined internal components, Coan part numbers COA‑22230 and COA‑22818A, ensuring a complete, ready-to-install package that supports reliable power transfer under extreme conditions.

By replacing the heavier steel OEM drums, the 7075 aluminum construction reduces rotating mass, which results in quicker throttle response, improved fluid flow, and faster shift recovery without compromising strength. Despite its lightweight profile, the assembly is built to endure severe torque spikes and high-heat cycles, making it a dependable choice for performance-oriented builds. With seamless integration into stock TH400 cases and compatibility with OEM friction packs and bushings, this direct drum kit aligns with Coan’s reputation for delivering precision-engineered upgrades that enhance both drivetrain responsiveness and durability.