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Powerglide

Servo Piston Return Spring
Part No. 28133

The servo return spring is the source of many "mystery" band failures caused by inconsistent servo release and weak springs prone to collapse. Sonnax servo return spring 28133 for GM Powerglide units is a lighter-than-stock spring ideal for low line pressure applications of 175 psi or less.

If this spring is installed in applications with more than 175 psi, the servo may not fully release due to the pin bias effect, resulting in dragging and burning of the band. Sonnax 28133-HD is recommended for higher pressure applications.

April 27, 2016

Understanding & Overcoming the Powerglide Servo Pin Bias Effect - Part 1

Topics: Diagnostics And Theory Transmission GM Powerglide Transmission

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April 26, 2016

Prevent "Mystery" Powerglide Band Failures by Overcoming the Servo Pin Bias Effect

Topics: Diagnostics And Theory Transmission GM Powerglide Transmission

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