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The magic answer: It's a bad tire. Maybe more than one.

For some occurrences, the interval between running normally and onset of the intolerable wobble ("IW" haha) can be only several miles, maybe less than an hour of driving.

With all the components that would normally introduce play being new, seems the cause would have to be either bad tire(s) or a shucked tire weight. Vibration must have a point of origin.
 

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I'm thinking it's the gearbox. I've tried adjusting it, but maybe just worn out. It's not a vibrations or ballance issue. It's just very loose and drify feeling. Hard to keep in the lane. Takes constant steering corrections.
Wait, in the opening post you wrote "It's not the feel of a loose gearbox either." lol!

So the problem really would be characterized as "drift" then. Hmm, on a jeep you can tighten the adjustment until it's physically impossible to turn the steering wheel. Seems that should also be doable on these actuators.

Of course, adjustment so there's just a little play, not so tight as to be sticky, and not so loose that you're wandering all over the road (which seems to be the current condition).

If unable to get the play out of the steering so that the vehicle can be safely driven, it may be time to seek professional advice? Or (since most of us would hate to do that), maybe try swapping out the steering actuator?
 

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...What is the steering actuator? There's the pump, hydroboost, and gearbox. Sytem is on good order, no noise or leaks.
Steering actuator = "gearbox," output is via Pitman arm, which connects to the drag link, which moves the steering mechanism

Before hydraulic assist (power steering), the box was called a "gearbox" because that's what it was. With hydraulics (the internal design of which has some complexity, including feedback torque to the steering column), it technically became an actuator.

"Gearbox" has the advantage of having only two syllables. In everyday use, the terms are interchangeable -- people know the intended meaning (watch out for the Definition Nazis haha).

Please do post what the fix was once you get this figured out.
 
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