Sonnax 4L60, 4L60E, 4L65E, 4L70E Input Drum Reinforcement Kit
OPT Product Code: SNX-77733-51K$117.36
Product Details
The GM 4L60, 4L60-E, 4L65-E and 4L70-E input drum assembly is known to crack 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 drum reinforcement kit 77733-51K includes a custom manufactured overrun piston that is designed to be used only with a stamped steel forward piston, eliminating the need to use OE cast forward pistons or aftermarket billet forward pistons. Includes a custom manufactured overrun piston. Compatible with stamped steel forward pistons. Can be installed in early- and late-model units. Sleeve made from hardened chromoly steel. Sleeve design will not block clutch feed oil. An alternative input drum reinforcement kit 77733-01K is compatible with aluminum forward pistons, but cannot be used with stamped steel forward pistons. 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. Be aware, this requirement is the opposite of the requirement for input drum reinforcement kit 77733-01K.
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