steering problem on 1993 Ford E-150

I have replaced ball joints, drag link, radius arm bushings (both sides),front axle bushings (both sides), and steering box (3 times). Van still not right. Does anyone have any answers or help?

Asked by for the 1993 Ford E-150
Whats the van still doing? I have a 93 e-150 5.8 . Could you please explain your problem with the steering.