Ford vehicles equipped with 5R55W and 5R55S transmissions frequently exhibit problems such as poor line rise, erratic line pressure, delayed engagement, no Reverse, poor shift quality and burnt clutches. These troubles can often be traced to wear in the OE boost sleeve, which allows pressure escape that causes driveability concerns. Installing Sonnax boost valve kit 56947J-74K eliminates pressure loss and revives line rise and shift quality in all ranges.

Sleeve manufactured from highly wear-resistant aluminum
Hardcoat anodized aluminum valves combat premature 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, 1.625 in. Head Dia, 0.311 in. Stem Dia, 5.54 in. Length, For Chevrolet SB, Set of 8

MANLEY Valve, Race Master, Exhaust, 1.625 in. Head Dia, 0.311 in. Stem Dia, 5.54 in. Length, For Chevrolet SB, Set of 8

$408.60

MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia, Set of 8

MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia, Set of 8

$2,325.95

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.46 in. Length, Set of 8

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.46 in. Length, Set of 8

$2,461.66

MANLEY Valve, Extreme/Severe Duty, Exhaust, 1.9 in. Head Dia, 0.3415 in. Stem Dia, 5.7 in. Length, Gen II, Set of 8

MANLEY Valve, Extreme/Severe Duty, Exhaust, 1.9 in. Head Dia, 0.3415 in. Stem Dia, 5.7 in. Length, Gen II, Set of 8

$581.49

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.26 in. Height, Set of 8

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.26 in. Height, Set of 8

$2,461.66

MANLEY Valve, Custom, Titanium, .3100 in. Stem Dia, Set of 8

MANLEY Valve, Custom, Titanium, .3100 in. Stem Dia, Set of 8

$2,591.35