Common problems in vehicles with GM 4L80-E and 4L85-E transmissions include uncontrollable line rise (upward of 500 psi), high line pressure in Reverse, broken direct clutch drums and/or broken cases. These problems can be caused by excessive EPC torque signal pressure. Sonnax self-regulating boost valve kit 34200-10K eliminates these problems by limiting EPC pressure.

Hardened steel boost valve has an encapsulated relief valve that will allow EPC pressure to exhaust if it exceeds 95-105 psi
Boost valve with over 20% wider spools to provide better durability and increased sealing contact area
Boost valve spools have annular grooves to reduce side-loading that causes wear
Closely toleranced sleeve restores the hydraulic integrity between the valve and sleeve
O-Rings have been added to the sleeve to provide a positive seal that compensates for pump bore wear
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, Exhaust, 28.5 mm Head Dia, 6 mm Stem Dia, 98.05 mm Length, For Toyota Supra, Set of 12

MANLEY Valve, Race Master, Exhaust, 28.5 mm Head Dia, 6 mm Stem Dia, 98.05 mm Length, For Toyota Supra, Set of 12

$599.01

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia, Set of 8

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia, Set of 8

$2,293.03

MANLEY Valve, Titanium, Intake, Bead Loc, 2.15 in. Head Dia, 0.3415 in. Stem Dia, 5.44 in. Height, Set of 8

MANLEY Valve, Titanium, Intake, Bead Loc, 2.15 in. Head Dia, 0.3415 in. Stem Dia, 5.44 in. Height, Set of 8

$2,421.90

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia, Each

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia, Each

$350.52

MANLEY Valve, Race Master, Exhaust, 1.6 in. Head Dia, 0.311 in. Stem Dia, 5.77 in. Length, For Dodge, Set of 10

MANLEY Valve, Race Master, Exhaust, 1.6 in. Head Dia, 0.311 in. Stem Dia, 5.77 in. Length, For Dodge, Set of 10

$500.47

MANLEY Valve, Race Flo, Exhaust, 1.74 in. Head Dia, 0.372 in. Stem Dia, 4.908 in. Length, For Chrysler, Set of 8

MANLEY Valve, Race Flo, Exhaust, 1.74 in. Head Dia, 0.372 in. Stem Dia, 4.908 in. Length, For Chrysler, Set of 8

$380.66