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

2nd Gear Servo Kit
Part No. 77701-02K

.63 Ratio

OE Part No. 24230441

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With its .63 ratio, Sonnax 2nd Gear servo kit 77701-02K is an ideal option when upgrading GM 4L60-E and 4L65-E applications to improve shift feel without risk of harsh 1-2 shifts. These units were originally built with smaller, .45 ratio or V-6, V-8 .55 ratio servos, while the later 4L70-E came with a .63 servo. In all these units, a “Corvette” .74 ratio servo is often too large, aggressive or harsh shifting for stock-type applications, making the Sonnax .63 servo a perfect option for any build.

  • Improves 4L60-E and 4L65-E shift feel and durability without harshness
  • Direct replacement part for 4L70-E
  • D-Rings used in place of seal rings enhance sealing during apply and release.
  • Compatible with Sonnax 4th Gear super hold dual servo kit 77767K.
  • Piston
  • Housing
  • Piston D-Ring Small
  • Piston D-Ring Large
  • Housing O-Ring
  • 4L60-E, 4L65-E, 4L70-E 2nd Gear Servo Kit 77701-02K