Here is a little write up on removing the shifter knob on a G56 Tranny.
Its really easy but i have a few suggestions to keep from tearing up
your knob too much.
First thing i would suggest is do not try to pry out the middle piece
by sliding screwdrivers in the sides. I tried this and it really messes
up the knob. If you ever plan on reusing your knob or not, this is how
i would suggest to do it, it made quick work on removing it.
1. First grab a drill, small drill bit and just about any screw. I used a decking screw that i had in the garage.
2. I drilled a small hole right in the middle to help get the screw
started. Make sure your hole isnt too big the screw is going to strip
the hole.
3. You can use either a screwdriver or a drill. I used a drill and
screwed the screw in and it popped the middle piece right out.
(Yes i know, i just pretty much ruined the middle piece but i messed up
the shifter knob even worse trying to pry the middle piece out. The
middle piece shouldnt be more than $10-$15 to replace. The shifter knob
on the other hand will probably cost a lot more if you want one thats
not all tore up from trying to remove it.)
4. Once the middle piece is removed its straight forward. Use a 15MM deep socket to remove the nut.
5. Unscrew the shifterknob and its off.
