Sorry, thought I saw you mention something about having this problem of yours most noticeable at around 45-55 mph.
Going back to where we started, have you checked the list of things mentioned above?
Still working on it. I started moving my wheels back and forth with one hand on the steering box and pitman arm and seems to have more play than i thought with a mild cluck. other than that, the only thing that really stood out to me was the track bar bushing on the frame side. I torqued to 125lbs (jacks under axle) and pulled my SS off. Im gonna put the wheels on and take her for a spin. See if there is any difference. Hopefully for the better. Ill be back soon. Thanks everyone for your help so far, i really appreciate it.