4L60, 4L60-E, 4L65-E, 4L70-E
Input Drum Reinforcement Kit
Part No. 77733-02K
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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 Sonnax input drum reinforcement kit 77733-02K.
- Sleeve made from hardened chromoly steel
- Can be installed in early- and late-model units*
- Sleeve design will not block clutch feed oil
*Will not repair a cracked drum. Requires 96-earlier aluminum forward piston or Sonnax billet forward piston 77764-01, cannot be used with stamped steel forward piston.
- Reinforcement Sleeve
- Overrun Piston Inner Seal
February 22, 2016
Too Close For Comfort: Pinpointing 4L60-E Gear Train Assembly Problems
Steve Garrett
Topics: Transmission GM 4L70-E Transmission 4L60-E Transmission 4L65-E Transmission
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