GM Powerglides 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 28821-01K improves transmisison performance and durability under high-pressure conditions.

High-strength billet aluminum piston also features a rounded profile for better stress distribution
Dual O-ring-style piston improves sealing in worn or scuffed cases
Easy to install, no case modifications required

More From This Category

RTS Performance Transmission Super-R Rebuild Kit Ford C4,1970-on, Raybestos & Kolene Kit

RTS Performance Transmission Super-R Rebuild Kit Ford C4,1970-on, Raybestos & Kolene Kit

$702.00

Motive Gear Axle Shaft, 1541 Manganese, 5x4.5 in. Bolt Pattern, 30.563 in. Length, 27SPL, For CHEVROLET AVONDALE 1994–1997, Each

Motive Gear Axle Shaft, 1541 Manganese, 5x4.5 in. Bolt Pattern, 30.563 in. Length, 27SPL, For CHEVROLET AVONDALE 1994–1997, Each

$210.02

Sonnax Zip Kit®, Toyota/Lexus U660E, U660F, Each

Sonnax Zip Kit®, Toyota/Lexus U660E, U660F, Each

$544.81

MANLEY Connecting Rod Pin Bushing, Bronze, .975 in. OD, .929 in. ID, .975 in. Length, Each

MANLEY Connecting Rod Pin Bushing, Bronze, .975 in. OD, .929 in. ID, .975 in. Length, Each

$22.80

Motive Gear Differential Master Bearing Kit, Timken, Suits Ford 9 Inch Diff, 2.891" x 1.781" LM102910/LM102949, Std Pinion Support

Motive Gear Differential Master Bearing Kit, Timken, Suits Ford 9 Inch Diff, 2.891" x 1.781" LM102910/LM102949, Std Pinion Support

$217.80

Motive Gear Axle Shaft, 1541 Manganese, 5x4.5 in. Bolt Pattern, 29.125 in. Length, 27SPL, For JEEP GRAND CHEROKEE 1994–1998, Each

Motive Gear Axle Shaft, 1541 Manganese, 5x4.5 in. Bolt Pattern, 29.125 in. Length, 27SPL, For JEEP GRAND CHEROKEE 1994–1998, Each

$200.05