sjrucke, the service and inability to have a tied steering sounds like you have some worn part of your steering linkages, possibly wore out bushings. I'd check the tie rod ends first.
EXCESSIVE PLAY IN STEERING WHEEL
1. Worn or loose suspension or steering components. 1. Inspect and repair as necessary.
2. Worn or loose wheel bearings. 2. Inspect and repair or adjust bearings.
3. Steering gear mounting. 3. Tighten gear mounting bolts to specification.
4. Gear out of adjustment. 4. Replace gear.
5. Worn or loose steering coupler. 5. Inspect and replace as necessary.
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