When shifting into reverse it won't go in unless you rev it then it slams in. The old owner may have put a shift kit on it.sticking valve?
Possible burned reverse band or burned direct clutches. Could be misplaced check ball in valve body.
I told this jackass what you said and offered to help him but he said it was his torque converter and his "racing engine". So the dip shit destroyed it 2 days later. He thought reving the crape out of it to get to move was normal.
That snapping sound when it finally catches isn't a good thing. I hope you told him, "Here's your sign".
If in fact this car was stick shift, the pilot bushing should have been removed from the crank. Many time the converter nose cannot fit into the back of crank pilot and will destroy the pump. This should have been caught at installation time.
that was suposed to be funny:roflmao: but it wasnt.............Can't do that.