WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Front Ride Height Measurement - F-250 and F-350, Rear Wheel Drive (RWD)
Courtesy of FORD MOTOR CO.
Fig 2: Front Ride Height Measurement - F-250, F-350, Four Wheel Drive (4WD), F-450 and F-550