- Transmission & Drivetrain
- Sonnax Smart-Tech 4L80/4L85-E Overrun Clutch Valve Kit
The underlying weakness found within GM 4L80 & 4L85-E Transmissions is the overdrive roller clutch. Insufficient holding power in the overdrive roller clutch can lead to clutch failure and subsequent damage to the drum, planetary assembly and mating components.
Sonnax’s Smart-Tech Overrun Clutch Valve Kit offers a hydraulic solution to a mechanical problem. A patent-pending valve assembly keeps the overrun clutch applied in low gears, allowing the clutch to share the load the overdrive roller clutch would struggle with on its own. This complete kit provides everything needed to complete the modification and can drastically increase the life of the transmission.
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Features:
- Improves Overdrive Roller Clutch Holding Power in Lower Gears
- Extends the Life of Workhorse Transmissions
- Installs Quickly onto the Valve Body Without Removing the Transmission