Printpartsummary
Symptoms:
  • Burnt clutches
  • Delayed engagement
  • Erratic line pressure
  • Low line rise
  • Low Reverse boost
  • No Reverse
  • Poor fuel economy
  • Poor shift quality
  • Reverse slip
  • Soft shifts
Cause:

OE boost sleeve deterioration allows pressure loss that leads to driveability concerns.

Correction:

Recover hydraulic control and renew shift performance by installing Sonnax boost valve kit.

5R55S, 5R55W

Boost Valve Kit

Part No.

56947J-74K

Boost Valve Kit
  • 56947j-74k_combo

  • Boost Valve Kit

Small_56947j-74k_combo Small_56947j-74k

5R55S, 5R55W

Boost Valve Kit

Part No. 56947J-74K

  • Sleeve
  • Inner Boost Valve
  • Outer Boost Valve

Complaint:

  • Burnt clutches
  • Delayed engagement
  • Erratic line pressure
  • Low line rise
  • Low Reverse boost
  • No Reverse
  • Poor fuel economy
  • Poor shift quality
  • Reverse slip
  • Soft shifts

Cause:

OE boost sleeve deterioration allows pressure loss that leads to driveability concerns.


Correction:

Recover hydraulic control and renew shift performance by installing Sonnax boost valve kit.

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

Related Parts

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

  • Test Locations

Click here to view PDF if instructions do not appear below.

It appears you don't have a PDF plugin for this browser. Click here to view the PDF file.

Contact a Sonnax Distributor to purchase this part.