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 piston return spring 28133 for GM Powerglide units is a lighter-than-stock spring ideal for low line pressure applications of 175 psi or less.

More From This Category

Sonnax Rear Unit Endplay Shim, GM, Th400, Th425, 4L80-E, 4L85-E

Sonnax Rear Unit Endplay Shim, GM, Th400, Th425, 4L80-E, 4L85-E

$13.75

Motive Gear Differential Master Bearing Kit, Koyo, For DODGE VIPER 1993–1999, Kit

Motive Gear Differential Master Bearing Kit, Koyo, For DODGE VIPER 1993–1999, Kit

$196.48

Sonnax Pinion Batwing Washer, GM 4L80E '99-Up

Sonnax Pinion Batwing Washer, GM 4L80E '99-Up

$31.77

Motive Gear Differential Pinion Bearing Kit, Koyo, For CHEVROLET K1500 1988–1998, Kit

Motive Gear Differential Pinion Bearing Kit, Koyo, For CHEVROLET K1500 1988–1998, Kit

$86.64

Sonnax Cin. Ratio Servo Kit, Ford, C4, C5 Non-Anodized, Each

Sonnax Cin. Ratio Servo Kit, Ford, C4, C5 Non-Anodized, Each

$359.78