I special ordered a 2000 F150 7700 with the 5.4 Triton. From 60-67 mph there is a small vibration and a slight power loss. At all other speeds the truck runs smoothly, and has plenty of power to spare.Accelleration from a stop is smooth and the tranny shifts flawlessly, even under pedal to the metal. Has anyone out there experienced this, and what fixed the issue.