727 shifting problem

With the load put on the trans from parking on the steep hill could have stuck the trans in park and you damaged the shift arm or shaft forcing out of park.Should be an easy fix.
Did it take a good pull to shift out of park?
You should set the park brake before putting the trans in park on steep grade.

Thanks for the info much appreciated.Im gonna drop pan & valve body this weekend and see what I find.Btw I forgot to mention at the top of the long steep driveway it leveled out flat so there was no load on it at all and e-brake was on.This van is a beast it's over 5000 lbs has a 6in lift 33in tires pumped 360.once I get better at pc I will post pics of all my MOPARS.