Checking Fluid Level: Transmission
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1990 Ford Ranger, 1990 Ford Pickup, 1990 Ford F-Super Duty, 1990 Ford Bronco II, and 1990 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
Check lubricant level at filler plug hole on side of transmission. It should be level with bottom of filler hole. Add lubricant as needed.