4L60E 4L65E 4L70E Input Drum order Reinforcement Kit by Sonnax

4L60, 4L60-E, 4L65-E, 4L70-E Input Housing Overrun Sleeve Kit Sonnax Part No. 77733-51KA

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 order 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
Contents
Overrun Piston
Reinforcement Sleeve Overrun Area
Overrun Piston Seal Outer
Overrun Piston Seal Inner

Warning:
This kit must be used with a '97-later stamped steel forward piston. It cannot be used with '96-earlier aluminum forward piston or Sonnax billet forward piston 77764-01.