No Low Gear (Manual 1st)
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.
Internal or external shift linkage, valve body bolts improperly torqued (gasket damage), SS1 failure to operate correctly, valve body components (manual control valve, low reverse modulator valve, 1-2 shift valve, 2-3 shift valve, BS1 check ball, 4-3-2 timing valve) and low-reverse one-way clutch assembly.