To remove automatic knob: 1: Remove tiny cir-clip from bottom of knob. 2: Slide knob down to reach the top cir-clip. 3: Lift off bird button and remove top cir-clip. 4: slide knob off of chrome shaft. 5: Use new cir-clips when reinstalling (they are 1/4").

You might check if your gear selector plate is firmly attached to console. The hold-down clips break when it is pulled away from console unless removed properly.