No Forward Gears
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2002 Mercury Grand Marquis, 2002 Lincoln Town Car, 2002 Ford Crown Victoria, 2001 Mercury Mountaineer, and 2001 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
Fluid level and condition, shift linkage, low forward clutch pressure, low line pressure, filter (plugged or damaged), valve body (3-4 shift valve, main regulator valve, manual valve stuck or damaged), incorrectly tightened valve body bolts, valve body gaskets damaged, 2-3 accumulator, pump assembly, forward clutch assembly, low one-way clutch assembly (planetary) or output shaft.