 I've been a loyal Ford brand buyer since '65; 23 units to date. My new 150 SuperCab 5.4 is a drivetrain vibrating 3 valve knocking nightmare.  The dealer has had the vehicle on three separate occasions with excuses that started with the tires and now says a counter balance is needed to reduce (?) the vibration.  I do not care if they changed driveshaft vendors and are having problems. I want a drivetrain that turns true. Period! The new 3 valve setup runs rougher than corn cob. The dealer blames it own Mother Ford and says the techies have not come up with a patch for the computer program that runs the darn thing without disturbing the tranny.  I am in shock, mourning and complete disbelief.