Product Description
Fits: 4L60-E / 4L65-E / 4L70-E · 300mm non-reluctor
Sonnax Smart-Tech input housing kit with heavy duty input shaft, part number 77733-11K, for GM 4L60-E, 4L65-E and 4L70-E transmissions. It fits 300mm non-reluctor style units and increases 3-4 clutch capacity for higher horsepower, higher pressure applications.
Specifications
| Fits | 4L60E, 4L65E, 4L70E |
|---|---|
| OE number | 17803686 |
| Torque converter size | 300mm non-reluctor |
| Sonnax part number | 77733-11K |
How it works
The weak OE backing plate in the GM 4L60 series input housing flexes during clutch apply, letting heat build up unevenly in the limited clutch pack space. This is the root cause of 3-4 clutch burnup in performance applications.
The Smart-Tech housing makes room for a taller 3-4 clutch pack, anchored by a stronger bolt-on backing plate that keeps the clutches parallel. The housing is treated to resist fatigue failure, a steel reinforcement sleeve prevents breakage in the spline area, and a custom backing plate replaces the OE retaining ring to eliminate the risk of blowout. The high-strength input shaft is designed to resist failure from stress cracks. The housing and shaft are also available separately.
Clutch pack choices: eight .067 in frictions with seven .095 in steels, or nine .062 in frictions with eight .077 in steels.
What's included
- Smart-Tech input housing with 300mm non-reluctor style input shaft assembly
- Overrun piston
- Overrun piston inner seal
- Overrun piston outer seal
- PTFE impregnated rear stator support bushing
- 3-4 clutch apply plate
- 3-4 clutch return springs (10)
- Bolt-on anchor plate
- Socket head cap screws (15)
Notes
Earlier versions of this kit required an aluminum forward piston.
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 .
DISCONTINUED Sonnax 4L60E 4L65E 4L70E Transmission Smart-Tech® Input Housing Kit with Heavy Duty Input Shaft Part No.
