There is (on an AX5 anyhow) a spring-loaded retainer that holds the shifter on to the top cover of the trans. Pull the shift knob and the dust boot off the shifter, then remove the 4 little bolts that hold the thick rubber seal onto the tranny tunnel, and pull up the seal. Press down on the retainer and rotate it counterclockwise 1/4 turn, and it should pop up. It's kind of hard to do if your hands or the retainer ring are greasy, so spend a minute and clean it all up before you try. Kind of hard to describe, but you'll see what I'm talking about when you do it....
HTH,
Jeff