From a F150 forum...
{snip}
"Anyone familiar with the process / success of lemon law pursuits? My new 2014 Lariat Supercab has been in the dealer's shop more than my driveway and they do not seem to be able to find the cause of my issue. I have a vibration at 35 - 40 MPH which they have thrown everything at to no avail (tires, driveshaft, axles, etc.). With only 1,200 miles and no obvious cause, I don't think I want this particular truck anymore, especially $40,000 poorer. Anyone with experience in returning a truck, I'd like to hear how it went with Ford. It's kind of sad that my 2000 Lariat with 330,000 miles rides better than the 2014."
Interesting that neither GM or Ford has the ability to diagnose this type of issue (at least at the dealer level) without throwing parts at it.