Torque Converter Clutch Always Applied (Stalls Vehicle In Drive & Manual 2nd Gear Only)
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2002 Lincoln Navigator, 2002 Ford Expedition, 2001 Lincoln Navigator, 2001 Ford RV Cutaway, and 2001 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Low line pressure, improperly torqued valve body bolts (gasket damaged), torque converter clutch solenoid, pump assembly (converter clutch control valve) and torque converter assembly. See TORQUE CONVERTER under COMPONENT TESTS in appropriate OVERHAUL article.