4L60, 4L60-E, 4L65-E, 4L70-E
Smart-Tech®
Input Housing Kit
Upgraded Housing Eliminates
3-4 Clutch Failure
Limitations of the OE input housing are the root cause of 3-4 burnup in performance applications. The patented Sonnax Smart-Tech housing design makes room for a taller clutch pack anchored in place by a stronger backing plate. Get the most out of your favorite clutches — the Smart-Tech housing is the only way to increase clutch capacity AND protect against destructive heat.
Kit available with or without heavy duty input shaft
Smoke the tires, not the clutches
The OE input housing will always let you down with another burnt 3-4 clutch. The weak backing plate flexes during clutch apply, allowing heat to build up unevenly within the clutch pack’s limited space. Burnup is the common result.
Stop the flex and you stop 3-4 clutch failure. The Sonnax Smart-Tech housing’s apply and backing plates surround a larger clutch pack area to keep the clutches parallel and maximize protection against overheating.
See the Flex – Watch the Demo Video
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Increase 3-4 Clutch Capacity
Anchor (backing) plate works with redesigned apply plate for more room allowing thicker steels and clutch options for eight .067" frictions with seven .095" steels or nine .062" frictions with eight .077" steels for increased torque capacity. -
Stop 3-4 Backing Plate Flexing & Distortion
Zero-flex, bolt-on anchor plate replaces OE backing plate to eliminate clutch pack distortion and uneven clamping pressure. -
Protect Against Fatigue Failure
Treated housing is significantly more resistant to fatigue failure. -
Prevent Housing Breakage
Steel input drum reinforcement sleeve prevents breakage in the shaft/spline area. -
End 3-4 Retaining Ring Blow-Out
Fifteen bolts secure anchor plate, eliminating snap-ring and blow-out concerns.
Key Housing Benefits
Input Housing Kit Options
