got a 94 early 4.0 x300 sovereign
feels very floaty and vague,tramlines badly
speedhumps,even taken slowly make such a loud thud,as does every undulation in the road
no knocks or rattles from the usual places-drives very quiet
just very wallowy and unsure on the road?
any pointers
cheers

 

just a hunch, but check your balljoint and tie rod boots,
I've seen worn balljoints have a similar effect on some late model fords