BILLET SERVO PISTON (DUAL CAST METAL RINGS, RINGS INCLUDED)

The Coan Racing COA‑12846A Billet Servo Piston (Dual Cast Metal Rings) is a precision-engineered replacement for GM Powerglide transmissions, crafted to meet the rigorous demands of performance and race applications. This piston is machined from high-grade billet material and fitted with dual cast metal sealing rings, delivering robust hydraulic integrity and enhanced resistance to wear and thermal fatigue. Designed to exact specifications, it installs directly into standard servo bores, ensuring reliable sealing and controlled piston movement during gear shifts.

Ideal for both high-stress street/strip builds and professional race setups, the COA‑12846A restores precise servo actuation and maintains consistent line pressure, ultimately delivering cleaner, firmer shifts and improving transmission durability.