Vehicles with Toyota/Lexus A750E/F, A760E/F/H, A761E, A960E/F and AB60E/F transmissions may exhibit insufficient line rise in drive ranges and excessively high pressures in Reverse. This may be caused by continuous oscillation of the steel boost valves within the cast aluminum sleeve, creating excessive wear and a path for EPC, cutback and Reverse pressure to leak.
Severe wear at the Reverse circuit allows line pressure to cross-leak to the EPC circuit, causing abnormally high pressures. Wear in the cutback circuit allows fluid to cross-leak into an exhaust circuit, causing low line pressure resulting in soft shifts and band failures. Sonnax boost valve kit 147741-01K has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.

Boost sleeve is manufactured from highly wear-resistant billet aluminum to prevent the excessive wear exhibited by the cast OE sleeve
Hardcoat anodized aluminum valves combat premature wear
Restores proper line rise
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, For Toyota 3UR-FE, 38mm Head Dia, Each

MANLEY Valve, Race Master, For Toyota 3UR-FE, 38mm Head Dia, Each

$48.92

MANLEY Valve, Race Flo, Intake, Bead Loc, 2.02 in. Head Dia, 0.3125 in. Stem Dia, 4.955 in. Length, For Chrysler HEMI, Each

MANLEY Valve, Race Flo, Intake, Bead Loc, 2.02 in. Head Dia, 0.3125 in. Stem Dia, 4.955 in. Length, For Chrysler HEMI, Each

$142.29

Sonnax Oversized Pressure Regulator Valve, ZF5Hp19, Late Vb E18.2, Each

Sonnax Oversized Pressure Regulator Valve, ZF5Hp19, Late Vb E18.2, Each

$74.75

Trick Flow Valve, Exhaust, Stainless Steel, 1.760 in. Diameter, .341 in. Stem, 5.060 in. Length, Big For Ford, Each

Trick Flow Valve, Exhaust, Stainless Steel, 1.760 in. Diameter, .341 in. Stem, 5.060 in. Length, Big For Ford, Each

$76.10

MILODON Valves, Intake, Race, Stainless Steel, 2.30 in. Dia, +.350 Long, Big For Chevrolet, 396, 427, 454, 502, Each

MILODON Valves, Intake, Race, Stainless Steel, 2.30 in. Dia, +.350 Long, Big For Chevrolet, 396, 427, 454, 502, Each

$79.09

Sonnax Oversized Tc Pressure Valve Kit, Chrysler, Ch 845Re, ZF8Hp/45/55/70, Each

Sonnax Oversized Tc Pressure Valve Kit, Chrysler, Ch 845Re, ZF8Hp/45/55/70, Each

$37.73