Thrust Washer Shim - Pump To Drum (.020)

THRUST WASHER SHIM, PUMP TO DRUM (.020)

The Coan Racing COA‑12420A Thrust Washer Shim (.020") is a precision-machined component designed to fine-tune endplay between the pump and drum in GM Powerglide transmissions. Measuring 0.020 inches thick, this shim allows builders to achieve optimal clearance, ensuring proper alignment and reducing friction between rotating assemblies.

Manufactured to exacting standards, the COA‑12420A installs seamlessly without requiring modifications, making it an essential tool for both performance tuning and routine transmission maintenance. Whether used individually or stacked with other shims, it provides the flexibility needed to maintain drivetrain integrity and longevity.