February 21, 2013
In Ford 5R55S and 5R55W units, the direct clutch is applied in Reverse, 4th and 5th Gear by the variable force PC-C solenoid. Fluid pressure from the solenoid (VFS3) is routed through the Reverse pressure modulator and reverse engagement valves, which then stroke appropriately to route apply pressure to the direct clutch. Wear at the Reverse pressure modulator valve bore and end plug results in leakage of the solenoid feed and direct clutch apply pressures, resulting in slipping or loss of 4th/5th Gear, burned direct clutches and delayed Reverse engagement.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.