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

Smart-Tech® Input Housing Kit with Heavy Duty Input Shaft

Part No.

77733-11K

OE Part No: 17803686, 17803687

Smart-Tech® Input Housing Kit with Heavy Duty Input Shaft
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  • Smart-Tech® Input Housing Kit with Heavy Duty Input Shaft

  • Smart_tech_web_image

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

Smart-Tech® Input Housing Kit with Heavy Duty Input Shaft

Part No. 77733-11K

OE Part No: 17803686, 17803687

  • Smart-Tech Input Housing with 300mm Non-Reluctor Style Input Shaft Assembly
  • PTFE Impregnated Rear Stator Support Bushing
  • Overrun Piston Inner Seal
  • Overrun Piston
  • 3-4 Clutch Apply Plate
  • 3-4 Clutch Return Springs (10)
  • Overrun Piston Outer Seal
  • Bolt-on Anchor Plate
  • Overrun Piston Outer Seal
  • Socket Head Cap Screws (15)

Fits 300mm non-reluctor units.

Limitations of the GM 4L60-E, 4L65-E, 4L70-E OE input housing are the root cause of 3-4 burnup in performance applications. The weak OE backing plate flexes during clutch apply, allowing heat to build up unevenly within the clutch pack’s limited space. Stop the flex and you stop 3-4 clutch failure. The unique Sonnax Smart-Tech housing design makes room for a taller clutch pack anchored in place by a stronger backing plate, making it the only way to increase clutch capacity and protect against destructive heat. Numerous other improvements to the housing ensure maximum durability and protection against failure in higher horsepower, higher pressure applications.

Smart-Tech input housing kit with heavy duty input shaft 77733-11K fits 300mm non-reluctor style units. The high-strength shaft features many unique refinements available only from Sonnax, including a unique design that protects against failure from stress cracks. Both the housing and shaft also are available separately.

  • Physically larger clutch pack area for increased 3-4 clutch capacity without sacrificing clutch durability. Use your choice of:
    • Eight .067" frictions with seven .095" steels
    • Nine .062" frictions with eight .077" steels
  • Anchored backing plate keeps clutches parallel to stop the flexing and distortion that leads to heat build-up
  • Treated housing is significantly more resistant to fatigue failure
  • Steel reinforcement sleeve prevents breakage in the spline area
  • Custom backing plate replaces OE retaining ring to eliminate risk of blowout

Learn more about the Sonnax Smart-Tech Input Housing

WARNING:

Earlier versions of this kit required an aluminum forward piston. It is recommended to follow the specific instructions provided during assembly to avoid a mismatch of parts.

NOTE:

Requires '91-later 3-4 apply ring; Requires '97-later ring gear; Requires '97-later stamped steel forward piston. Cannot be used with aluminum forward piston or Sonnax billet forward piston 77764-01. See instructions for further detail.

  • Patent No. 8,857,592

Related Parts

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Eliminate 3-4 Clutch Failure with the Smart-Tech® Input Housing

The flawed design of the 4L60/E OE input housing will always let you down with another burnt 3-4 clutch. When the weak backing plate flexes during clutch apply, heat builds up and the clutches cook. Stop the flex and you stop 3-4 clutch failure.

Watch this video to see the OE backing plate flex and how the Sonnax Smart-Tech® input housing eliminates this issue. It's the ONLY way to guarantee you're getting the most from your favorite clutches.

Contact a Sonnax Distributor to purchase this part.