SONNAX SERVO RELEASE CHECK VALVE
# 37759

SONNAX SERVO RELEASE CHECK VALVE

2nd Gear Servo Release

Symptoms:

  • Reduced 3-4 clutch life
  • 2-3 Shift feel poor
  • 3-2 Bind-up

Cause:
Inadequate metering of the 2nd band servo release oil.

Correction:
This part combines an orifice with a ball check valve to meter servo release oil.


Technicians would like to find a way to successfully extend the life of 3-4 clutches, and improve the 2-3 shift feel. They have been trying, with limited success, since the GM 4L60 (700-R4) and 4L60-E series transmissions were introduced. Inadequate metering of 2nd gear band servo release oil causes 3-4 clutch failure. The 3-4 clutch and 2nd gear band are not properly synchronized. Sonnax servo release check valve kit is a unique solution that combines an orifice with a ball check valve to resolve these problems.

  • Improved design meters servo release oil, reducing 3-4 clutch failure
  • Provides sufficient exhaust so that 3-2 downshifts are smooth
  • Calibrates 3-4 clutch feed orifice without creating shift concerns

Kit Contains:

  • O-Ring
  • Valve

SONNAX Installation Instructions

Type of Product: Sundry Parts
Years:
Alternative #: