i have a 2005 ses 5speed with 71k miles on it. but when im at highway speeds. the focus vibrates from front to back. it feels like it starts in the front, but its not a constant vibration is on off on off. like when you going 70 miles an hour in 5 gear its like rrrrrrr rrrrrrrr rrrrrrrrrr rrrrrrrrr. every vibe is jus like the one before it. not any harder or longer exactly the same every time. i have kno idea what this is but it happens at about 70 and doesn't matter if your in 5 gear or neutral, giving gas or jus coasting.