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

2nd Gear Super Hold Servo Kit
Part No. 77911-03K

View Instructions

Sonnax 2nd gear super hold servo kit 77911-03K for GM 4L60 (700-R4), 4L60-E, 4L65-E and 4L70-E units delivers 18% more apply area than the “Corvette” servo (largest OE). It's the perfect choice for performance applications when a larger-than-OE servo is desired, and its unique design avoids the timing flaws and excessive shock loads found in other aftermarket servos. Combine this servo kit with Sonnax 4th gear servo 77767K for unmatched holding power and shift performance that's an easy in-vehicle install.

  • 18% More apply area than OE "Corvette" servo
  • Maximizes holding power in 2nd gear with more positive 1-2 and 2-3 shifts
  • Dual seals ensure positive band apply/release and eliminate cross leaks
  • Chromoly steel apply pin is longer than longest OE pin and features added seals to reduce leakage of 3rd gear pressure
  • Servo and piston made from durable billet aluminum
  • 2nd Gear Piston
  • Separator
  • Apply Pin
  • D-Rings, Small (2)
  • D-Rings, Large (2)
  • O-Ring, Small
  • O-Rings, Large (2)
  • PTFE Seals (2)
  • 2nd Gear Piston
  • Separator
  • Apply Pin

May 31, 2009

A New Trick in the Bag: Additional Second-Gear Servo Size for the 4L60-E

Gregg Nader

Topics: Rebuilding Tips Transmission GM 4L70-E Transmission 4L60 Transmission 4L60-E Transmission 4L65-E Transmission

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April 28, 2017

4L60/E Performance & Heavy-Duty Transmission Build Charts

Topics: Rebuilding Tips Transmission GM 4L60-E Transmission 4L60 Transmission 4L70-E Transmission 4L65-E Transmission

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August 23, 2017

First, Do No Harm: Things You Should Know about Performance Servos

Gregg Nader

Topics: Miscellaneous Rebuilding Tips Transmission GM Powerglide Transmission Powerglide, Cast Iron Transmission C4 Transmission C6 Transmission 4L70-E Transmission 4L60-E Transmission 4L65-E Transmission 4L60 Transmission

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  • 77911 03k