The Sonnax 28712-12 high clutch drum flange is a precision-engineered component designed specifically for Powerglide transmissions utilizing 1.80 or 1.65 ratio planetary gear sets. Featuring a 12-tooth spline, this flange plays a critical role in maintaining proper alignment and engagement of the high clutch assembly, helping to ensure smooth and consistent transmission operation. Manufactured from high-strength material, it offers exceptional durability and resistance to wear, making it a reliable choice for both high-performance builds and professional transmission rebuilds. Whether you’re upgrading or replacing an existing flange, the Sonnax 28712-12 provides a direct-fit solution that meets or exceeds OEM specifications, supporting long-term reliability and improved drivetrain performance.

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