Best answer I've seen so far to TEMPORARILY get moving again.
2004 chrysler crossfire will not shift from park to revers - JustAnswer

Phaedrus39 mentioned above as well

Attached are some diagrams.

I hear this is a major issue with the Chrysler 300 and Dodge Charger.
A recall on those was issued.

I think a recall is in order for the Crossfire as well, judging from the number hits I get when Googling the works Crossfire shift stuck park.

Tell your Chrysler rep if it happened to you. That's what I doing. My car is in the shop with this issue right now.