I have a chance to pick-up a 1999 F-250 ext cab 4x4, The guy said it broke I the timing chane. The truck only has 60,000 miles and i know the guy pretty well and the truck was damm near new, I haven't work on any of theses motors, Is this a common, I have never heard of it happening, seems like some thing eles would be wrong too, he don't drivr it hard barley 60 on a good day tops. any body know any thing?