first get a new shift knob with set screws b/c the shifter will not be threaded after you are through. take the original shifter out, put the bottom in a vice sideways --------- so it wont move. grab the fat part of the shifter with your hands if you can get a good grip on it, or use some kind of plier things, then twist it off, not sure which way it turns. but the fat part will come off and expose a rod. take that fat part and lay it to the side. take the other part out of the vice and put the new shift knob on it. there you have it. hope this helps.

my buddy did this the other day. came out great. perfect size. its a lil shorter than he wanted, but its taller than mine that i bought was which was good b/c mine was flush with my console lol, hurt my fingers to shift b/c i kept hitting the console lol.