IIRC from discusions before the original service interval was 60k miles but when Ford saw that the belt was doing good and there weren't many failures they pushed it back to 80k. But I think I have heard the line for the life of the car, and most likely most people would not keep a car past 100k so if the belt lasts that long it has lasted the life of the car.
I knew something was up with the tesnioner because in the morning I could hear it making noise when the car was started. Also I think the accesory belt tensioner is making noise now...
my father and I only changed the timing belt but it took us about 4 to 5 hours taking our time and making sure everything was right
