Some typical problems in vehicles with a Ford A4LD transmission are low line pressure in forward or Reverse, soft upshifts, delayed Reverse and poor modulator control. These complaints can often be caused by a worn boost sleeve, which allows Reverse and/or TV pressure to cross-leak or exhaust. Sonnax boost valve kit 56947-05K replaces worn parts and matches the OE-style, low-ratio valve.



56947-02K
56947-05K

Ratio
High
Low


Ø A
.388"
.323"

Ø B
.571"
.571"

Ø C
.634"
.606"

Engine
4.0L
2.3, 2.8, 2.9, 3.0L


Low ratio, OE-style valve
Hardcoat anodized aluminum valve combats premature wear
Sleeve manufactured from highly wear-resistant aluminum
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

More From This Category

MANLEY Valve, Race Series, Intake, 31.45 in. Head Dia, 7 .215 in. Stem Dia, 7 4.764 in. Length, Gen II, Set of 8

MANLEY Valve, Race Series, Intake, 31.45 in. Head Dia, 7 .215 in. Stem Dia, 7 4.764 in. Length, Gen II, Set of 8

$547.03

MANLEY Valve, Titanium, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.56 in. Height, Set of 8

MANLEY Valve, Titanium, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.56 in. Height, Set of 8

$2,461.66

MANLEY Valve, Pro Flo, Intake, 2.08 in. Head Dia, 0.3133 in. Stem Dia, 4.935 in. Length, For Chevrolet SB, Each

MANLEY Valve, Pro Flo, Intake, 2.08 in. Head Dia, 0.3133 in. Stem Dia, 4.935 in. Length, For Chevrolet SB, Each

$78.54

MANLEY Valve, Severe Duty, Intake, 1.71 in. Head Dia, 0.3415 in. Stem Dia, 4.73 in. Length, For Buick V6, Set of 6

MANLEY Valve, Severe Duty, Intake, 1.71 in. Head Dia, 0.3415 in. Stem Dia, 4.73 in. Length, For Buick V6, Set of 6

$370.40