GM Powerglide transmissions used for drag racing generate higher line pressure than the OE servo piston can withstand. At pressures over 200 psi, the OE piston can crack, resulting in transmission failure. Sonnax servo piston kit 28821-02K improves transmission performance and durability under high-pressure conditions. The piston can be assembled using only one seal ring for lower friction, two aluminum seal rings or any combination in between.

High-strength billet aluminum piston also features a rounded profile for better stress distribution
Dual PTFE seals improve sealing, are low-friction and interchangeable with the OE cast aluminum seal ring
Easy to install, no case modifications required

More From This Category

MANLEY Connecting Rod Pin Bushing, Bronze, .910 in. OD, .828 in. ID, 1.025 in. Length, Each

MANLEY Connecting Rod Pin Bushing, Bronze, .910 in. OD, .828 in. ID, 1.025 in. Length, Each

$22.80

Motive Gear Differential Master Bearing Kit, Koyo, For CHRYSLER ASPEN 2007–2009, Kit

Motive Gear Differential Master Bearing Kit, Koyo, For CHRYSLER ASPEN 2007–2009, Kit

$243.70

Sonnax 4-5-6 Accumulator Piston Kit, GM, 6T70/75/80 (Gen 2), Each

Sonnax 4-5-6 Accumulator Piston Kit, GM, 6T70/75/80 (Gen 2), Each

$44.78

Motive Gear Differential Master Bearing Kit, Timken, For JEEP TJ 2003–2006, Kit

Motive Gear Differential Master Bearing Kit, Timken, For JEEP TJ 2003–2006, Kit

$238.97

TCI Powerglide Steel Gerotor Pump

TCI Powerglide Steel Gerotor Pump

$1,813.28

Wilwood Bearing Cup, Hub, Inner

Wilwood Bearing Cup, Hub, Inner

$9.32