The tires were brand new when I bought the car in April - they are Kumho's. But I will need the tire rotation in mind.

Lower control arm bushings were what I suspected also and something that hasn't yet been replaced. When my guide rod mounts were bad, the car had a pretty dang strong shimmy on the highway at those speeds all the time. The new rod mounts, that has been mostly eliminated, just with the occasional shimmy every now and then. But still, to me it indicated that something is a bit loose in the front suspension, and I don't like that. I'll inspect the lower control arm bushes again... I bet I should have had the dealer replace those lower control arm bushes when they did my lower balljoints... Blah.

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84 300SD - bought in April '06 with 237,000 mi