I bought the truck brand new in Oct 2014 and ever since it has been nothing but a problem when it comes to the vibration/shuddering that consistently happens at speeds 25-35 MPH in third and fourth gear and as well when driving highway speed 65-75 MPH. The check engine light has never come on and Ford has told me they haven't found anything, yet they never took it for a test drive. They just connected it to a machine in hopes of seeing a fault code. Well, no engine light no fault code maybe they should think outside the box and actually take it for a drive. This issues have been brought to the Ford dealer a minimum of four times for this same issue. It's an Eco boost with a 3.73 rear end and I was told since it's a heavier rear end I will feel that shudder or vibration to which I call BS. I love the truck but I am sick and tired of this issue and others I will document on future posts. This thing has been a nightmare, I wonder why I even traded my Sport-trac in on it.