Shift Solenoids (SSA, SSB, SSC)
WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
Three ON/OFF solenoids are used for electronic shift scheduling. The three solenoids are located in the main control valve body. The solenoids are two-way, normally open style. Shift solenoids SSA, SSB, and SSC provide selection of first through fourth gear by controlling the pressure of the three shift valves.