I have a 2001 f 150 supercab with 143k miles.i have a vibration in frt. Can feel in steering wheel and floor,when going over 50 m.p.h.cant figure out.any help? Thanks

 

Alignment, BJs, Tire balanced, Brakes, Messed up wear on tires from alignment bad shocks etc. You should start checking around search vids on youtube how to check things like ball joints.

 

Look for loose tie rod ends and idler arms, jack up each side independently and try moving the tire left right up and down, any looseness is a give away of what to look at and replace. Ball joint lower, wheel hangs out at the bottom. A lot of these just need good air shocks to stiffen the big wheels travel up. If you have never reshocked, look for loose first and 4 new shocks next with tire rotation/balancing of course. A series of potholes the front begins to bounce and gets worse due to the shocks not dampening them out. Bing/bang/boom.