does these trucks have any known problems with the engine and tranny. it is a 5.4l v8 with 210000 miles. needs a tune up and the timing chain makes a ticking sound. it is a loaded larait center console sunroof leather seats. what is a truck like this worth already cleaned and tuned up. i have a 3 door 2000 z71 i was kinda thinking of trading in on it. mine has 5.3l with 150,000 miles on it but i want a 4 door. mind you i am in no hurry to get a 4 door. are these fords good for a lot of miles. thanks steve