7075 Billet Aluminum Direct Drum Assembly w/ Super Sprag, 4 Clutch Intermediate

ALUMINUM DIRECT DRUM (7075 BILLET) ASSY. W/SUPER SPRAG, 4 CLUTCH INTERMEDIATE

The Coan Racing COA‑22815A Aluminum Direct Drum Assembly is a race-oriented upgrade engineered for Turbo Hydramatic 400 transmissions. Machined from high-grade 7075 billet aluminum in the USA, it features a lightened direct drum design with a robust Super Sprag and a four-clutch intermediate. This configuration provides reliable one-way clutch engagement and significant torque handling capacity, making it ideal for drag, bracket, and aggressive street applications.

By replacing the heavier steel OEM drum with this billet aluminum version, the COA‑22815A dramatically reduces rotating mass, which improves throttle response, shift speed, and fluid flow without sacrificing strength. It installs easily into stock TH400 cases, fitting standard bushings and friction packs with no machining required. Built to Coan’s high-performance standards, this direct drum assembly offers an effective combination of lightweight design, strength, and durability for builders aiming to enhance drivetrain efficiency and engagement precision.