Shift Overlap Control
WARNING: This page is about a different car, the 2007 Ford Expedition EL and 2007 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
The electro-hydraulic shift action is obtained by means of various valves in the transmission control module (TCM) and main control valve body, actuated by pressure regulators. They engage or disengage the relevant clutches or brakes at the correct moments.