Symptoms:

  • Erratic line pressure
  • Delayed engagement
  • Pump noise
  • Pump rotor & cover damage
  • Overheated converter
  • Lube failures

Cause:

The instability of the main pressure regulator valve, combined with the slide return spring, can cause extreme pressure spikes in the decrease (PC) oil circuit. When the inboard end of the pressure regulator valve wears, the CBY or bypass oil cannot flow past the regulator valve, causing delayed engagements and reduced converter fill and lube oil flow.

Correction:

The Sonnax kit contains an oversized anodized valve with modified spool lengths which better regulates converter/lube flow and restores hydraulic stability

4F50N, AX4N, AX4S, AXODE

Oversized Pressure Regulator Valve Kit
Part No. 96206-10K

Late


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The main pressure valve regulates line by pushing the pump slide into a decrease or limiting position. The instability of the valve, combined with the slide return spring, causes pressure spikes in the decrease (PC) oil circuit of more than 500 psi. When the inboard end of the pressure regulator valve wears, the CBY or bypass oil cannot flow past the regulator valve. This causes delayed engagements and reduced converter fill and lube oil flow. In the 1998 and later AX4Ns, Ford changed the spool lengths on the pressure regulator valves at the converter/lube feed area. This change was to allow the converter circuit to be fed sooner. In the pre-1998 design, the converter/lube circuit is completely closed at high line pressure. The oversized Sonnax pressure regulator valve 96206-10K mimics the later OE design to prevent converter/lube-related problems at high line pressure.

  • Hard-coat anodized valve prevents wear.
  • Modified spool lengths provide better converter/lube feed.
  • Two springs included to re-establish correct regulating pressures.
  • Valve
  • Springs (2)

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.

Ford AX4N/4F50N Valve Body Layout

Ford ax4n 450n
  • 96206 10k combo
  • 96206 10k