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, Severe Duty, Exhaust, 1.88 in. Head Dia, 0.311 in. Stem Dia, 5.422 in. Length, BBC, Each

MANLEY Valve, Severe Duty, Exhaust, 1.88 in. Head Dia, 0.311 in. Stem Dia, 5.422 in. Length, BBC, Each

$75.93

MANLEY Valve, Race Flo, Intake, 2.1 in. Head Dia, 0.3133 in. Stem Dia, 4.874 in. Length, For Chevrolet LS1, Each

MANLEY Valve, Race Flo, Intake, 2.1 in. Head Dia, 0.3133 in. Stem Dia, 4.874 in. Length, For Chevrolet LS1, Each

$47.58

MANLEY Valve, Race Master, Exhaust, 32.0 mm Head Dia, 6 mm Stem Dia, 94.0 mm Length, For Nissan VQ35, Each

MANLEY Valve, Race Master, Exhaust, 32.0 mm Head Dia, 6 mm Stem Dia, 94.0 mm Length, For Nissan VQ35, Each

$70.76

Sonnax Oversized Clutch D1/E Control Valve Kit, Ford, 6R60/75/80/100, ZF6Hp19/26/32, Each

Sonnax Oversized Clutch D1/E Control Valve Kit, Ford, 6R60/75/80/100, ZF6Hp19/26/32, Each

$49.88

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.06 in. Height, Each

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.06 in. Height, Each

$307.70

MANLEY Valve, Race Series, Intake, 2.2 in. Head Dia, 0.311 in. Stem Dia, 5.7 in. Length, Gen II, Each

MANLEY Valve, Race Series, Intake, 2.2 in. Head Dia, 0.311 in. Stem Dia, 5.7 in. Length, Gen II, Each

$70.15