A4LD, 4R44E, 4R55E, 5R55E

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.

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. The Sonnax oversized pressure regulator and boost valve kit 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.

Contents:

• Pressure Regulator Valve
• Spring Small
• Spring Large
• Boost Valve High Ratio
• Boost Sleeve High Ratio
• O-Rings (2)

SONNAX Installation Instructions