Many threads regarding this issue. Most every one says the play is in tie rod ends and idler arm. Check these first. On my 81, these were ok. I adjusted the set screw on the top of the gear box. Turning it out, counter clockwise about half a turn, then tightening the jamb nut. Made a big difference. turning it out too far will cause binding in the box, steering will be stiff to return to center. Also look closely at the flex joint just above the gearbox, seen a few that were sloppy. Have someone rock the steering wheel back/forth while you hold the joint to feel for play.
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