Symptoms:

  • Low base line pressure

Cause:

Low spring rates, incorrect spring heights and inappropriate replacements from previous rebuilds.

Correction:

This replacement spring provides a resultant idle base line pressure of 72psi, consistent when compared to the OEM orange spring.

200-4R, 4L60

Elevated Pressure Main Pressure Regulator Spring
Part No. 77917-08

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Low spring rates, incorrect spring heights and inappropriate replacements from previous rebuilds can lead to low base line pressure. The Sonnax replacement spring 77917-08 provides a resultant idle base line pressure of 72 psi, and 82-85 psi cracking pressure, which is consistent with the OE orange spring

  • The Sonnax replacement spring is stronger than many alternatives, and allows increased pressures throughout the stroking action of the pressure regulator valve.

Low line pressure resulting from worn boost valves, a worn pump bore at the pressure regulator valve or pump pocket wear will not be corrected by this spring.

  • 200-4R, 4L60 Elevated Pressure Main Pressure Regulator Spring 77917-08
  • 200-4R, 4L60 Elevated Pressure Main Pressure Regulator Spring 77917-08