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.

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

Input Housing Overrun Sleeve Kit
Part No. 77733-51KA

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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 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
  • Overrun Piston
  • Reinforcement Sleeve Overrun Area
  • Overrun Piston Seal Outer
  • Overrun Piston Seal Inner
  • 4L60, 4L60-E, 4L65-E, 4L70-E Input Housing Overrun Sleeve Kit 77733-51KA
  • 4L60, 4L60-E, 4L65-E, 4L70-E Input Housing Overrun Sleeve Kit 77733-51KA