Servo Release Check Valve Kit, for 4L60, 4L60-E, 4L65-E, 4L70-E, Sonnax
Servo Release Check Valve Kit, for 4L60, 4L60-E, 4L65-E, 4L70-E, Sonnax
Servo Release Check Valve Kit, for 4L60, 4L60-E, 4L65-E, 4L70-E, Sonnax
Servo Release Check Valve Kit, for 4L60, 4L60-E, 4L65-E, 4L70-E, Sonnax
Servo Release Check Valve Kit, for 4L60, 4L60-E, 4L65-E, 4L70-E, Sonnax
Servo Release Check Valve Kit, for 4L60, 4L60-E, 4L65-E, 4L70-E, Sonnax

Servo Release Check Valve Kit, for 4L60, 4L60-E, 4L65-E, 4L70-E, Sonnax

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  • $24.55

Superseded Part Number: 77701-076, S74480C

Interchange Part Number: 77701-076, S74480C

Surface Finish: new

Manufacturer Part Number: 77701-076, S74480C

Other Part Number: 77701-076, S74480C

Brand: Sonnax

UPC: Does not apply

Hello, If you need assistance finding a part please supply the VIN number of your NORTH AMERICAN vehicle AND the part number you are looking for. 

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.

Warning:

Must be used with properly functioning OE capsule.

4L60, 4L60-E, 4L65-E, 4L70-E

Servo Release Check Valve Kit
Part No. 77701-076

2nd Gear Servo Release

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 77701-076 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
  • O-Ring
  • Valve
.
_Thank you for looking!
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