4L60 4L60E 4L65E 4L70E Transmission 2nd Gear Super Hold Servo Kit Sonnax The Sonnax 2nd gear super hold servo kit 77911-03K for GM 4L60/4L60-E has 18% more apply area than the Corvette servo (largest OE) and maximizes holding power in 2nd gear with more positive 1-2 and 2-3 shifts. Dual seals on the 2nd gear piston and separator ensure positive band apply/release and eliminate cross leaks This servo is the perfect option when more holding power is desired without causing excessively harsh upshifts and downshifts The included apply pin is longer than the longest OE pin, and has added seals to reduce leakage of 3rd and 4th gear oil pressure