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

4th Gear Super Hold Dual Servo Kit
Part No. 77767K

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Sonnax 4th gear super hold dual servo kit 77767K features 40% more apply surface area for greater holding power in GM 4L60 (700-R4), 4L60-E, 4L65-E and 4L70-E units. Vehicles with these transmissions often exhibit poor 3-4 shift quality and experience band failure in performance applications. Combine this servo kit with Sonnax 2nd gear servo 77911-03K for unmatched holding power and shift performance that's an easy in-vehicle install.

  • Patented dual-piston design with 40% more apply delivers greater holding power
  • D-ring seals prevent pressure loss
  • Use with OE, “Corvette” or Sonnax 2nd gear servo assemblies
  • Super Hold Servo Assembly
  • Steel Washer

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  • 77767k