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Smart-Tech® Input Housing Kit
Part No. 77733-06K
PTFE Impregnated Rear Stator Support Bushing
Modified Input Housing
Input Drum Reinforcement Sleeve
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)
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.
Sonnax Smart-Tech input housing kit 77733-06K 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. The housing also is available with a pre-installed, heavy-duty input shaft.
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.
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