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
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