BILLET SERVO O-RING SET (PAIR)

The Coan Racing COA‑12311A Billet Servo O‑Ring Set (Pair) is a precision sealing solution crafted specifically for GM Powerglide transmissions. These billet-style O‑rings are engineered to fit the low‑servo piston, forming a reliable barrier that maintains hydraulic pressure without extrusion under intense load conditions.

Their robust design and high-grade composition ensure long-lasting performance, even under thermal cycling and high-frequency shifting scenarios common in racing or spirited street use. Ideal for both routine rebuilds and high-demand Powerglide builds, the COA‑12311A set restores critical servo sealing, safeguarding clean and consistent shift quality.