If it's anything like the 2000 F150 Sport my uncle has, it will run forever. He'll hit 500,000 miles on his some time next year. His is a SWB, std. cab with the 4.2 V6/5 speed. Engine has never been touched, and literally still runs about like new.. The truck is finally starting to show it's mileage cosmetically though.
Nice. How is the rear window seal? I still haven't replaced mine, and the rear floorboard is starting to show it.