Billet Aluminum Direct Piston .485" - 9/10 Clutch w/ Super Drum

BILLET ALUMINUM DIR PISTON (.485") 9/10 CLUTCH W/ COAN SUPER DRUM

The Coan Racing COA‑12826A Billet Aluminum Direct Clutch Piston (.485″, 9/10‑Clutch w/ Coan Super Drum) is a precision-engineered upgrade crafted for high-capacity GM Powerglide transmissions equipped with Coan’s Super Drum 9‑ or 10‑clutch setups. Machined from billet aluminum, this piston delivers lightweight durability and exceptional hydraulic locking action, while its .485″ thickness is tailored to optimize clutch pack spacing in high-energy configurations.

Designed for direct drop-in installation, it restores ideal fluid dynamics and pressure application within the clutch stack, enhancing engagement consistency, shift firmness, and thermal performance under extreme conditions. Whether you're reinforcing a drag-ready Super Drum or refreshing a street/strip powerhouse, the COA‑12826A piston offers improved reliability, precise fitment, and boosted performance in high-torque Powerglide builds.