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Manufacturer Part Number: 56947J-74K

Other Part Number: S46741FK

Brand: Sonnax

5R55S, 5R55W

Boost Valve Kit
Part No. 56947J-74K

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
  • Sleeve
  • Inner Boost Valve
  • Outer Boost Valve

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