In my 1984 300D, the problem was that a spring-detent broke off to jam turning the assembly. It wasn't a problem with the tumblers jamming, nor a problem with the steering lock rod applying pressure. That detent is underneath the steel plate which is crimped to the aluminum lock housing. Once you pry the cover off, you'll see it. The spring holder came out in pieces. I don't really need those detents since the switch has never rotated out of "run" in the 15 years since I fixed 'er (tossed the broken offending parts). I probably should have taken the steering lock rod at at that time since it isn't of much help today and can only cause problems.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans