No Engine Braking In Manual 1st Gear
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.
Improperly torqued valve body bolts (gasket damaged), check balls missing or damaged, valve body components (3-4 shift valve, low reverse clutch modulator valve, D2 valve, 4-3-2 timing valve, 2-3 shift valve, coast clutch shift valve), valve body separator plate, coast clutch assembly and low-one way clutch assembly.