My car was working fine but when I parked it for a minute on a hill, then went to move it the gear was stuck in park. So I decided to yank it into drive but when I did it just went to neutral. Now my RESERVE doesn't work, REVERSE is in NEUTRAL, NEUTRAL is in DRIVE, and DRIVE is in 3. The car drives perfectly in 3 and everything seems to work fine and there's no leakage or knots coming from the engine. But how do I fix it and how much would it cost?