The boost valve assembly is designed to increase line pressure in Drive and Reverse. When the Aisin AW 450-43LE sleeve is worn on the inside or loose within the valve body, boost or EPC fluids can leak to exhaust or cross-leak and increase forces on the valve. Leakage to exhaust reduces line rise, while the cross-leaks can result in broken clutch drums or cases. Sonnax main boost valve kit 94987-09K has upgraded materials to prevent wear and restore proper hydraulic control.

Sleeve is manufactured from highly wear-resistant billet aluminum
Hardcoat anodized aluminum valve combats premature wear
Restores proper hydraulic sealing and OE pressure control
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

More From This Category

MANLEY Valve, Race Master, Intake, 37.5mm Head Dia, 0.2355 in. Stem Dia, 4.722 Length, For Ford 5.0L, Each

MANLEY Valve, Race Master, Intake, 37.5mm Head Dia, 0.2355 in. Stem Dia, 4.722 Length, For Ford 5.0L, Each

$51.07

Sonnax Oversized Solenoid Switch Valve & Plug Kit, 40Tes/41Tes/42Le/42Rle/RFE, Each

Sonnax Oversized Solenoid Switch Valve & Plug Kit, 40Tes/41Tes/42Le/42Rle/RFE, Each

$103.01

MANLEY Valve, Severe Duty, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Set of 8

MANLEY Valve, Severe Duty, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Set of 8

$607.34

MANLEY Valve, Race Flo, Intake, 2.1 in. Head Dia, 0.3125 in. Stem Dia, 4.99 in. Length, For Chrysler HEMI, Set of 8

MANLEY Valve, Race Flo, Intake, 2.1 in. Head Dia, 0.3125 in. Stem Dia, 4.99 in. Length, For Chrysler HEMI, Set of 8

$400.37

MANLEY Valve, Severe Duty, Intake, 1.72 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Length, SBC, Set of 8

MANLEY Valve, Severe Duty, Intake, 1.72 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Length, SBC, Set of 8

$628.35

MANLEY Valve, Race Master, Exhaust, 1.615 in. Head Dia, 0.3136 in. Stem Dia, 5.23 in. Length, For Chevrolet LS7, Each

MANLEY Valve, Race Master, Exhaust, 1.615 in. Head Dia, 0.3136 in. Stem Dia, 5.23 in. Length, For Chevrolet LS7, Each

$51.07