Diagnosing a front end wiggle at 35mph

Dartswinger70 said

Ok, just to bevclearvi say "shakedown" I mean do the checks, not necessarily "shake " things. But yes, you'd unload the torsion bar tension and see if ball joints have radial and axial play. Basically side to side and up and down, then tie rods, idler arm, Pittman arm, wheel bearings, strut rods and bushings, then as said tires,wheels, basically every possible thing, run over it with a fine toothedccomb as they say

Click to expand...

I have no idea what you mean about "unloading the torsion bar to check things."
The way you check your lower ball joints is to position a jack under the lower control arm as close as you can to the outside end of the LCA. You jack up the LCA until the tire is off the ground about 3/4". Take a pry bar and try to lift that tire, while watching the lower ball joint stud. I believe the FSM allows 1/16", but that is about double what it should be.
You can shake the tires back & forth, up and down while looking for excess slop in all the connections, like tie rod ends, wheel bearings, etc. Some of the bushings can be visually inspected for cracking/ separation. Check for cracked welds, cracked UCA ears on frame, cracked strut rod anchor on K-frame, etc