With its .63 ratio, Sonnax 2nd Gear servo kit 77701-02K is an ideal option when upgrading GM 4L60, 4L60-E and 4L65-E applications to improve shift feel without risk of harsh 1-2 shifts. These units were originally built with smaller, .46 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, 4L60-E and 4L65-E shift feel and durability without harshness
• Direct replacement part for 4L70-E
• Upgraded Viton^® D-rings used in place of seal rings enhance sealing during apply and release.
• Compatible with Sonnax 4^th Gear super hold dual servo kit 77767K.