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

TCI TH400 Direct Drum Nitrided Clutch Plate (.090 Thickness).

TCI TH400 Direct Drum Nitrided Clutch Plate (.090 Thickness).

$106.42

TCI Automatic Transmission Shield, Flexplate, Steel, Black Powdercoated, Torqueflite, Mopar, Big Block Only, Kit

TCI Automatic Transmission Shield, Flexplate, Steel, Black Powdercoated, Torqueflite, Mopar, Big Block Only, Kit

$303.11

TCI Input Shaft, Hardened, Vaccu Melt 300, Stock Carrier, Stock 26-Spline, For Ford, Automatic, C-4, Each

TCI Input Shaft, Hardened, Vaccu Melt 300, Stock Carrier, Stock 26-Spline, For Ford, Automatic, C-4, Each

$529.85

Sonnax Performance Pack, GM, 4L60-E, 4L65-E, 4L70-E, Each

Sonnax Performance Pack, GM, 4L60-E, 4L65-E, 4L70-E, Each

$302.73

TCI P/G Band Adjustment Screw

TCI P/G Band Adjustment Screw

$124.10