Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • Delayed engagement
  • Erratic buzz
  • High line pressure in Reverse
  • Low line rise
  • Soft shifts
  • Uncontrolled pressure in Reverse
Cause:

Wear at the pressure regulator valve bore allows vital main line pressure to exhaust and reduces converter charge pressure

Correction:

Refurbish the valve bore and install the Sonnax oversized valve and spring to restore proper hydraulic function and prevent future wear.

Tool Required VB-FIX Required

5R55N

Oversized Pressure Regulator Valve Kit

Part No.

56947J-39K

Oversized Pressure Regulator Valve Kit
  • 56947j-39k_combo

  • Oversized Pressure Regulator Valve Kit

Small_56947j-39k_combo Small_56947j-39k

5R55N

Oversized Pressure Regulator Valve Kit

Part No. 56947J-39K

  • Valve
  • Spring

Complaint:

  • Delayed engagement
  • Erratic buzz
  • High line pressure in Reverse
  • Low line rise
  • Soft shifts
  • Uncontrolled pressure in Reverse

Cause:

Wear at the pressure regulator valve bore allows vital main line pressure to exhaust and reduces converter charge pressure


Correction:

Refurbish the valve bore and install the Sonnax oversized valve and spring to restore proper hydraulic function and prevent future wear.

As the valve bore wears at the inboard spool, line pressure escalates with increased temperature and the pressure regulator valve does not stroke, reducing converter charge. As line pressure goes up, servo covers and pistons have excess pressure in reverse. Delayed engagements occur as the converter feed is reduced with excess bore wear. Line pressure will be reduced as the circuits between line, converter and exhaust wear. The Sonnax pressure regulator valve kit 56947J-39K can restore proper hydraulic function and prevent future wear.

  • Hard-coat anodized aluminum valve prevents wear and has modified spool length to maintain OE pressure curve
  • Includes replacement spring to restore OE pressures with oversized valve

Required Tools

You need this if...

Wear is visible or if vacuum test results in leakage as indicated:

A. Balanceline pressure port

B. Line pressure port

C. Converter charge pressure port

  • Test Locations

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Valve Body Layouts

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Valve Body Layout Ford 5R55N
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