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

Input Housing Forward Sleeve Kit
Part No. 77733-52K

Requires Sonnax overrun sleeve and compatible overrun piston. See instructions for details.

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Input housing failure at the shaft and forward piston areas is common in high-torque 4L60, 4L60-E, 4L65-E and 4L70-E transmissions. Sonnax input housing forward sleeve kit 77733-52K is used in combination with a Sonnax overrun sleeve to greatly increase the maximum strength of the housing and prevent these failures.

Installation of an overrun sleeve — available with Sonnax input housing overrun sleeve kit 77733-51KA and Smart-Tech input housing kits — is a common durability upgrade in these units. Even with an overrun sleeve, though, a large portion of the input shaft and aluminum housing spline connection remains unsupported. Adding the Sonnax forward sleeve kit nearly doubles support in this area, making it a recommended component for all high torque capacity work/sport vehicles.

  • High-strength, chromoly steel sleeve increases input housing torque capacity by protecting the shaft and forward piston areas
  • Maintains OE forward piston apply area
  • Combine with a Sonnax overrun sleeve for easy upgrades of older builds or new heavy-duty/high performance builds

  • Forward Piston
  • Forward Reinforcement Sleeve
  • Outer Forward Piston Seal
  • Inner Forward Piston Seal
  • Forward Piston Housing
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  • 4L60, 4L60-E, 4L65-E, 4L70-E Input Housing Forward Sleeve Kit 77733-52K
  • 4L60, 4L60-E, 4L65-E, 4L70-E Input Housing Forward Sleeve Kit 77733-52K details
  • 4L60, 4L60-E, 4L65-E, 4L70-E Input Housing Forward Sleeve Kit 77733-52K details