Shift Solenoids A & B
WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Shift solenoids A and B provide gear selection of first through fourth gears by controlling the pressure to the three shift valves.