Many Chrysler A904 and 42H/RE transmissions experience rear servo piston sticking/breakage, pin bore wear and reverse band slippage. The servo piston has a tendency to get cocked in the bore, inhibiting band apply. The high reverse line pressure continues to apply against a cocked piston, causing piston breakage. The bore of the piston also wears from side loading, resulting in insufficient band apply pressure. Sonnax billet aluminum rear servo piston 22912A addresses these problems.

Modified seal ridges prevent piston from sticking in case bore
Billet aluminum won’t crack like OE cast piston
2.540" O.D.

More From This Category

Sonnax RFE Transducer Connector, Chrysler, 45/545/65/66/68RFE, Each

Sonnax RFE Transducer Connector, Chrysler, 45/545/65/66/68RFE, Each

$57.70

MANLEY Connecting Rod Pin Bushing, Bronze, .904 in. OD, .744 in. ID, .780 in. Length, Each

MANLEY Connecting Rod Pin Bushing, Bronze, .904 in. OD, .744 in. ID, .780 in. Length, Each

$22.80

COMP Cams Cam Degree Bushing - 0 Degree

COMP Cams Cam Degree Bushing - 0 Degree

$23.25

Motive Gear Differential Super Bearing Kit, Timken, For BUICK CENTURION 1971–1972, Kit

Motive Gear Differential Super Bearing Kit, Timken, For BUICK CENTURION 1971–1972, Kit

$281.90

Motive Gear Differential Master Bearing Kit, Koyo, For CHEVROLET C30 1975–1986, Kit

Motive Gear Differential Master Bearing Kit, Koyo, For CHEVROLET C30 1975–1986, Kit

$367.48