You may want to put it safely on jack stands and see if you move the shifter in the car it also move the shifter on the trans. From what you described it sounds like you will see it moving which most likely a convertor or pump issue (no pressure) since no gears work and it goes into park. Please let us know what you find.I think when I shifted from 2nd passed drive into neutral and back into drive at high rpm I may have fried something inside the tranny . Shifts into park fine all other gears car just rolls like it’s in neutral … with ignition off I shift car threw the gears and it just rolls in every gear like it’s in nuetral
BTW - I believe you can rent a pressure gauge from the part store to verify.