Product Details

Smart-Tech Input Housing Kit with Heavy Duty Input Shaft

For the 700R4 and 4L60E automatic transmission

GM, Cadillac, Chevrolet, GMC, Pontiac, Oldsmobile

Part No. 77733-10K

Fits 1985-later 298mm units with 30-spline input shaft. For 1982-1984 298mm units with 27-spline input shaft, converter and stator shaft will need to be updated to 1985-later design.

Replaces OEM Part Numbers: 17803689, 08663580

Limitations of the GM 4L60 series 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 77733-10K fits 298mm torque converter 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

Important Note:

Requires 1991-later 3-4 apply ring; requires '97-later ring gear; requires '97-later stamped steel forward piston; requires '97-later dual-cage return spring. Cannot be used with aluminum forward piston or Sonnax billet forward piston 77764-01. See instructions for further detail.

 

Kit Contains:

• Smart-Tech® Input Housing with 298mm Input Shaft Assembly
• PTFE Impregnated Rear Stator Support Bushing
• Input Drum Reinforcement Sleeve installed
• Overrun Piston Inner Seal
• 3-4 Clutch Apply Plate
• 3-4 Clutch Return Springs (10)
• Bolt-on Anchor Plate
• Overrun Piston Outer Seal
• Socket Head Cap Screws (15)
• Overrun Piston

These transmissions are part of the Turbo-Hydramatic series and are also known as: 700R4, 4L60, 700-R4, TH700-R4, MD8, THM700R4, THM700-R4, 4L60E, 4L60-E, M30.