Machining Required

Printpartsummary
Machining Required

4L60, 4L60-E, 4L65-E, 4L70-E

Input Drum Reinforcement Kit

Part No.

77733-02K

Input Drum Reinforcement Kit
  • 77733-02k_combo

  • Input Drum Reinforcement Kit

Small_77733-02k_combo Small_77733-02k

4L60, 4L60-E, 4L65-E, 4L70-E

Input Drum Reinforcement Kit

Part No. 77733-02K

  • Reinforcement Sleeve
  • Overrun Piston Inner Seal

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
NOTE:

*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.

Click here to view PDF if instructions do not appear below.

It appears you don't have a PDF plugin for this browser. Click here to view the PDF file.

Contact a Sonnax Distributor to purchase this part.