"Car was very "light" feeling at speeds over 60mph..."

Once alignment checks out ok:

Adjusting the steering box can often improve on-center feel dramatically. Check to see if there is excess play in the steering 'upstream' of the steering linkage. I have yet to meet a 124/201 (admittedly limited sample size) that did not benefit from some adjustment to reign in play. This condition can even 'feel' like a pull to the right on crowned roads.

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1986 300E 5-Speed 240k mi.