To the differential question; ever seen a wrecker pull a car out if a pArking spot while its in park? I'm sure they still work ok.. Being in park only holds a car in place if both tires have traction. Odds are in an accident one of the tires will skid/slide anyway. So it will give before the trans will. I doubt there is any damage, also parking brake only effects rear wheels. So if the car is moved by an outside force the same would have still happened inside the trans...
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