Product Description
5R55S 5R55W Boost Valve Kit
Sonnax Part Number: 56947J-74K
NO TOOLING REQUIRED
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
PACKAGE CONTAINS
- Sleeve
- Inner Boost Valve
- Outer Boost Valve
SYMPTOMS
- No Reverse
- Reverse slip
- Low Reverse boost
- Delayed engagement
- Soft shifts
- Poor shift quality
- Low line rise
- Erratic line pressure
- Burnt clutches
- Poor fuel economy
CAUSE
OE boost sleeve deterioration allows pressure loss that leads to driveability concerns.
CORRECTION
Recover hydraulic control and renew shift performance by installing Sonnax drop-in boost valve kit.
