Sonnax 77911-03K 2nd Gear Super Hold Servo Kit for GM 4L60 4L60E 4L65E 4L70E Transmissions

The Sonnax 77911-03K 2nd Gear Super Hold Servo Kit is a high-performance upgrade designed for GM 700-R4, 4L60, 4L60-E, 4L65-E, and 4L70-E automatic transmissions. This complete servo kit delivers 18% more apply area than the factory Corvette servo (the largest OE option), providing significantly improved holding power for enhanced shift performance.

Key Features:

• Billet aluminum construction with 6061-T6 material for maximum durability
• Chromoly steel apply pin is longer than the longest OE pin with added seals to reduce 3rd and 4th gear oil pressure leakage
• Dual seal design on 2nd gear piston and separator ensures positive band apply and release
• Eliminates cross leaks that contribute to 2-4 band and 3-4 clutch failure
• Provides more positive 1-2 and 2-3 shifts without causing excessively harsh upshifts or downshifts
• Improved seal design conserves pump volume for better overall transmission efficiency

Complete Kit Includes:

• 2nd gear piston servo assembly
• Separator
• Apply pin with Teflon seals and rubber O-rings
• 2 small D-rings and 2 large D-rings
• 1 small O-ring and 2 large O-rings
• 2 PTFE seals
• Installation instructions

This servo kit is the ideal choice for performance applications requiring more holding power than stock while avoiding the timing flaws and excessive shock loads found in other aftermarket servos. For ultimate performance, Sonnax recommends pairing this 2nd gear servo with their 4th gear super hold servo (part number 77767K). Easy installation can be performed in-vehicle during transmission service or rebuild.