I just bought my second
stang. A 1990 GT Hatch. My first does not have this problem.
The front end is very very touching to bumps. And the car vibrates, shimmies when driviing. Definately at freeway speeds. It shakes the wheel.
The Left tie rod end boot was missing so I replaced it and the tie rod ends, and ball joints are still good.
It does need an alignment since the the front toe is out. But That would not cause the the shaking. Maybe some of it but not to this extent.
The only other thing I can think of would be the front struts...

....They still seem to dampen a little but on some bumps I will get a bounce after.
Do I sound right? That the struts are shot?