77733-11KB - 4L60 4L60E 4L65E 4L70E Transmission Smart Tech Input Housing 3-4 Clutch Pk 300MM Non Reluctor Units Only

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 77733-11KA 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. 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 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. Contents Overrun Piston Outer Seal Socket Head Cap Screws (15) PTFE Impregnated Rear Stator Support Bushing Overrun Piston Smart-Tech Input Housing with 300mm Non-Reluctor Style Input Shaft Assembly Overrun Piston Inner Seal 3-4 Clutch Apply Plate 3-4 Clutch Return Springs (10) Bolt-on Anchor Plate Overrun Piston Outer Seals.