Steering All Over the Place at 55mph+

TrailBeast said
A lot of good info so far, but I can add a little.
When I first got my Dart it would darn near change lanes if I hit one of those reflectors in the road, and the feel of the car overall was exactly like you described.
Scary huh?

My problems were caused by badly worn lower control arm bushings.
Once I replaced those and aligned it with more caster it smoothed right out and got WAY more stable.
I commonly run 80-90 on the more open freeways now with total confidence.

Some already mentioned steering and suspension parts, but since I went through the exact same thing you described, I thought I would tell you.

Very Scary Indeed! I think I'll take it for an alignment first, especially with that positive caster, and have the mechanic (one I trust who works on classics) inspect what everyone on the forum is discussing. I wish I had more pics to share but I'll post some before and afters of what I replaced. The upper control arm bushings looked and felt good but didn't inspect the bottom. As a novice mechanic I was worried about the force from the torsion bar which I didn't relive pressure (once again a novice trying to get the job done and was proud of myself for even being able to do ball joints and tie rod ends ). The boots on the Pitman and Idler arms were shot so probably a project for the summer anyway. At the time it took me a few hours to get that upper ball joint out and was ready to get it back together. I'll try to post more pics this weekend and get that alignment scheduled ASAP. Once again, y'all have been fantastic and thankful for the forum!