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, .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-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.

More From This Category

Sonnax Park Pawl Actuator Retaining Clip, GM, Powerglide

Sonnax Park Pawl Actuator Retaining Clip, GM, Powerglide

$11.33

Sonnax Oversized Vstv Pilot Pressure Valve, 01T, Each

Sonnax Oversized Vstv Pilot Pressure Valve, 01T, Each

$51.45

Sonnax Impeller Hub, Ford 6F35 (Early), Each

Sonnax Impeller Hub, Ford 6F35 (Early), Each

$61.68

Sonnax Pressure Regulator Sleeve Kit, Ford, 5R55S/W, Each

Sonnax Pressure Regulator Sleeve Kit, Ford, 5R55S/W, Each

$125.38

Sonnax Tool Kit, ZF6Hp21/28/34 (Generation 2), Each

Sonnax Tool Kit, ZF6Hp21/28/34 (Generation 2), Each

$690.98

Sonnax Sprag, Aisin Aw, Aw55-50Sn, Each

Sonnax Sprag, Aisin Aw, Aw55-50Sn, Each

$126.20