Billet 7075 Aluminum Direct Drum Assembly w/ 34 Element Sprag

ALUMINUM DIRECT DRUM (7075 BILLET) ASSY W/34 ELEMENT SPRAG

The Coan Racing COA‑22814 Aluminum Direct Drum (7075 Billet) Assembly with 34‑Element Sprag is a premium, lightweight upgrade engineered specifically for high-performance TH400 transmissions. Machined from 7075 billet aluminum, this direct drum delivers exceptional strength while cutting significant weight, reducing rotating mass for quicker throttle response and smoother high-RPM operation. Equipped with a heavy-duty 34‑element sprag, this assembly enhances one-way clutch reliability by distributing load across more rollers, minimizing slippage and increasing durability during aggressive launches and extended drag-strip sessions.

As a direct bolt-in replacement, the COA‑22814 combines the performance benefits of lighter rotating mass with the durability needed for high-stress racing, delivering tangible improvements in engine braking, shift responsiveness, and overall drivetrain efficiency. Whether you're building a bracket car, upgrading a street/strip cruiser, or assembling a pro-level race unit, this billet direct drum equips your TH400 transmission with enhanced strength and refined performance.