Insufficient holding power in the overdrive roller clutch is the underlying cause of chronic overdrive roller clutch failure in hardworking 4L80-E and 4L85-E transmissions. When the roller clutch fails, the damage can be catastrophic and the only fix is replacing the drum, planetary assembly and mating components.
The Sonnax Smart-Tech overrun clutch valve kit 34200-40K offers a hydraulic solution to this known mechanical problem. This patent-pending kit keeps the overrun clutch applied, allowing the clutch to share a load the OD roller clutch otherwise struggles with on its own.
Any other modifications to the valve body should be completed prior to installing Sonnax Smart-Tech® overrun clutch valve kit.
March 02, 2017
Topics: Diagnostics And Theory Transmission Ford GM 4R100 Transmission 4L80-E TransmissionRead Now
March 29, 2017
Topics: Transmission Report Newsletters Transmission GM 4T65-E Transmission 4L70-E Transmission 4L60-E Transmission 4L65-E Transmission 4L80-E TransmissionRead Now
Contact a Sonnax Parts Distributor.