PUMP TO DRUM BEARING (REQUIRES MACHINING TO PUMP .080)

The Coan Racing COA‑12421 Pump-to-Drum Bearing is a precision-engineered thrust bearing designed for the front pump interface of GM Powerglide transmissions. Functioning to accurately support load, this bearing ensures proper alignment and rotational freedom between the pump and drum. Installation requires machining the pump to a precise 0.080″ tolerance, ensuring a snug, accurate fit that minimizes friction, wear, and potential misalignment under high-pressure conditions.

Ideal for both performance builds and high-mileage rebuilds, the COA‑12421 delivers enhanced drivetrain reliability by providing smooth, stress-free rotation and maintaining crucial pump support integrity.