In reviewing old posts of mine, I see I never answered the outcome.

It took new quality brand name tires and a dealership alignment to fix the issues I was experiencing. I have no doubt all the parts I replaced were necessary as they were either worn out or the rubber was soft and deteriorated. Thanks for the help with this issue!

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Turbo300Mercede
87 300D W124
83 240D W123
80 300 TD Wagon W123, 4 Speed from 79 240D, SLS Rear Suspension