Transmissions with a ZF5HP19 can experience erratic line pressure, poor shift quality, Reverse complaints and B clutch breakage due to excess wear in the main pressure regulator valve bore. After reconditioning the bore, installing Sonnax oversized pressure regulator valve 85755-01 will restore hydraulic integrity for proper line pressure control in all ranges.

Oversized valves have annular oil grooves to support the valve and reduce wear rate
Salvages valve body castings

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