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2nd Gear Super Hold Servo Kit 4L60, 4L60-E, 4L65-E, 4L70-E
InfoVehicle Info Needed
SONNAXPART NUMBER: 852-77911-03K

2nd Gear Super Hold Servo Kit 4L60, 4L60-E, 4L65-E, 4L70-E

$12625
5 left in stock
ShippingShips on Sep 08, 2026
Lowest PriceLowest Price Guarantee

GM 4L60/4L60-E/4L65-E/4L70-E
2nd Gear Super Hold Servo Kit
  • 4L60, 4L60-E, 4L65-E, 4L70-E

    • 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
    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, which contribute to 2-4 band and 3-4 clutch failure. 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. For the ultimate servo combination in your 4L60/4L60-E, Sonnax recommends using the Sonnax 4th gear super hold servo 77767K with the Sonnax 2nd gear super hold servo kit 77911-03K.

    • 18% more apply area than OE Corvette servo
    • Dual seals on 2nd apply piston and separator
    • Servo piston and separator are made from 6061-T6 aluminum
    • O-ring seal between pin and 2nd gear piston
    • Two PTFE rings seal pin to bore
    • Servo pin is made from chromoly steel
    • Kit includes all necessary seals
    • Part TypeAutomatic Transmission Servo Piston
    BrandSONNAX
    Package Height3.2
    Package Width4.7
    Package Length5.2
    Weight1.14 PG
    Part CategoryReplacement Parts
    Part FitmentSemi Universal
    Vendor Part Number77911-03K
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews
    Please click here to download the instructions PDF file
    Some parts are not legal for use in California or other states with similar laws / regulations
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