What causes the gear shift to be stuck in park?
Common causes are: You're parked on a hill: When you park on a steep incline, pressure on the praw can cause it to get jammed into the parking gear. In this case, you have to relieve the stress to switch gears—often by recruiting another person to help you rock the vehicle back and forth.
Where is the neutral safety switch on a 2005 Chevy Impala?
The switch is mounted on the top of the transmission case and is visible as you look down into the right rear portion of the engine compartment (as you stand facing the front grille). It will be roughly below the brake master cylinder.