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 clutch rides).
Sonnax offers a hardened steel sleeve that reinforces the input drum to prevent this failure. OE overrun pistons must be machined when using this Sonnax input drum reinforcement kit.
Sleeve made from hardened chromoly steel
Can be installed in early- and late-model units*
Sleeve design will not block clutch feed oil
Note:
*Will not repair a cracked drum. Requires 96-earlier aluminum forward piston or billet forward piston # 37586, cannot be used with stamped steel forward piston.
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 clutch rides).
Sonnax offers a hardened steel sleeve that reinforces the input drum to prevent this failure. OE overrun pistons must be machined when using this Sonnax input drum reinforcement kit.
Note:
*Will not repair a cracked drum. Requires 96-earlier aluminum forward piston or billet forward piston # 37586, cannot be used with stamped steel forward piston.
Contents:
SONNAX Installation Instructions