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On an automatic I would hit the parking brake hard but put it in neutral. If you put it in park the car doesn't have to jiggle back and forth much to shear off the parking pawl.
I have a friend who buys all kinds of old rusty stuff. If he gets an old tractor with a locked up engine he puts a bunch of kerosene in the cylinders and puts in on his trailer, in gear, tied down loosely. All the rocking back and forth usually frees the engine up.
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