Symptoms:

  • Soft shifts
  • TCC apply concerns
  • Low line pressure

Cause:

A worn valve body bore allows line to leak to exhaust.

Correction:

This oversized valve and reamer kit resizes the valve bore and restores the hydraulic integrity of the circuit.

Warning:

Sonnax tool kit [56947-TL] must be used to resize the valve body bore to accept this repair. This tool kit is no longer in production, but may still be available from distributor inventory.

A4LD

Oversized Pressure Regulator & Boost Valve Kit
Part No. 56947-06K


You need this if... View Instructions Find a Distributor

Typical complaints about vehicles with an Ford A4LD transmission include soft shifts, low line pressure, and/or converter apply problems. A worn valve body bore at the pressure regulator valve can often cause these complaints. Line pressure is allowed to leak to exhaust, preventing the valve from stroking properly and feeding the converter apply circuit. Sonnax oversized pressure regulator and boost valve kit 56947-06K restores the hydraulic integrity of the circuits.

  • Replacement valve has been anodized to prevent excessive wear.
  • The converter apply spool land has been lengthened to increase spring force against the oversized valves.
  • Two stiffer springs have been included in the kit, to be used only for the late valve bodies (2nd and 3rd designs).
  • A high ratio boost valve kit is included to counteract the increased balance diameter on the pressure regulator valve.
  • Reamer kit works for both the early and late A4LD valve bodies.
  • Pressure Regulator Valve
  • Spring Small
  • Spring Large
  • Boost Valve High Ratio
  • Boost Sleeve High Ratio
  • O-Rings (2)
  • A4LD Oversized Pressure Regulator & Boost Valve Kit 56947-06K
  • A4LD Oversized Pressure Regulator & Boost Valve Kit 56947-06K

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.

A4LD Oversized Pressure Regulator & Boost Valve Kit Vacuum Test Locations