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  • Burnt clutches
  • Delayed engagement
  • Erratic buzz
  • Erratic line pressure
  • Harsh shifts
  • High line pressure in Reverse
  • Pressure control out-of-range codes
  • Soft shifts & poor line rise


Worn pressure regulator valve allows fluid loss that results in poor line pressure control.


Renew line pressure performance and restore optimal driveability by installing Sonnax pressure regulator valve.

5R55S, 5R55W

Pressure Regulator Valve
Part No. 56947J-77

You need this if... View Instructions

Ford vehicles equipped with 5R55W and 5R55S transmissions often exhibit driveability concerns such as delayed engagement, harsh or soft shifting and erratic line pressure, often resulting in burnt clutches. These troubles may be accompanied by an erratic buzz and/or pressure control codes. A worn pressure regulator valve allowing critical pressure loss from the line pressure circuit is very often the cause of these problems. Installing Sonnax pressure regulator valve 56947J-77 eliminates pressure escape to restore normal line pressure control in all ranges.

  • Hardcoat anodized aluminum valve combats premature wear
  • 56947j 77 combo
  • 56947j 77

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.

  • 56947j 77 test