The GM 4L60, 4L60-E, 4L65-E and 4L70-E input drum assembly is known to crack and strip out splines where the input shaft is pressed into it (where the overrun piston rides). Sonnax offers a hardened steel sleeve that reinforces the input drum to prevent this failure. Sonnax input housing overrun sleeve kit 77733-51KA includes a custom manufacured overrun piston designed for use only with a stamped steel forward piston, eliminating the need to use aluminum forward pistons. For additional torque capacity, this kit can be used in conjunction with input housing forward sleeve kit 77733-52K.

Custom overrun piston works with steel forward piston
Chromoly steel sleeve design will not block clutch feed oil
Universal design fits both early- and late-style units

More From This Category

Sonnax Supported Servo Pin & Cover Kit, GM, Powerglide, Each

Sonnax Supported Servo Pin & Cover Kit, GM, Powerglide, Each

$184.61

Sonnax Impeller Hub, GM, Comp GM-Rk-685, 688 & Wc, Each

Sonnax Impeller Hub, GM, Comp GM-Rk-685, 688 & Wc, Each

$105.02

Sonnax Thrust Bearing, GM 6T40/6T45, Each

Sonnax Thrust Bearing, GM 6T40/6T45, Each

$25.46

Sonnax Bore Sizing Tool, GM, For 154740-11K, Each

Sonnax Bore Sizing Tool, GM, For 154740-11K, Each

$400.49

Sonnax Flange Yoke, 1480 Series, Each

Sonnax Flange Yoke, 1480 Series, Each

$249.69

Sonnax Impeller Hub, Ford 6F35, Early, Each

Sonnax Impeller Hub, Ford 6F35, Early, Each

$35.55