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

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

  • Sale
  • $20.98

Brand: Sonnax

Other Part Number: S74480C

Interchange Part Number: S74480C

Manufacturer Warranty: Yes

OE/OEM Part Number: S74480C

Manufacturer Part Number: 77701-076

Surface Finish: NEW

Country/Region of Manufacture: United States

Placement on Vehicle: Front

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:

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

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

Servo Release Check Valve Kit

Part No.

77701-076
Servo Release Check Valve Kit
  • 77701-076-in_2-4servoimage

  • 77701-076_4l60-combo

  • 77701-076_4l60-e_combo

  • Servo Release Check Valve Kit

  • 77701-076-in_2-4servoimage

  • 77701-076_4l60-combo

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Small_77701-076_4l60-combo Small_77701-076_4l60-e_combo Small_77701-076 Small_77701-076-in_2-4servoimage

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

Servo Release Check Valve Kit

Part No. 77701-076
  • Valve
  • O-Ring

2nd Gear Servo Release

Complaint:

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

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 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
WARNING:

Must be used with properly functioning OE capsule.

Servo Release Check Valve; Must Use With D74480D or Original OE Capsule, Extends 3-4 Clutch Life and Improves 2-3 Shift Feel

Specifications

Transmissions

Name Years
4L60-E 1993 - 2014
THM700-R4 1981 - 1992
THM700-R4/4L60/MD8 1980 - 1994
4L65-E 2001 - 2007
4L70-E 2006 - 2009
4L60-E-HD 2002 - 2006

._Thank you for looking!
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