I've searched through most threads but found stuff mostly related to newer f150's with sticky ebrakes.

I have a 2000 f150 4x4 that is having a few vibration issues. At 40MPH the steernig wheel will start to shake slightly and pull to the right(actually it always pulls to the right so this might just be an alignment issue). But, at hwy speed the vibration gets very bad, the whole truck will shake. If I'm going down a hill and take my foot off the gas the vibration gets much worse. I've crawled under the truck thinking its ujoints, but there is no movement at all in the driveshaft, no elongating of the rear-end yoke, nothing that would indicats bad ujoints.

So whats next on the list of things to look at, out of ballance driveshaft?

 

Did you buy the truck new? If you got it used did you car-fax it?
~Phil

 

I bought it used but I've had it for almost three years now. It just started doing this within the last 6 mo or so.