On my 94 GP it was the same as all of the other GM vehicles for changing the knob (a staple like C clip and done) and I wound us using one from a monte carlo. I never did it for my 97 because of the performance shift button, but now that I have an 07 I no longer have that button and would like the T style shifter. This car though uses a very short phillips screw, and the slots to locate and keep the shifter from rotating are very short and at 3 and 9 o'clock as opposed to 12 and 6.
Long story short does anyone know off hand what other model GMs have shifters that would fit an 04+ GP? I was at the junkyard yesterday and doing a quick skim of chevy even the newer cars were using the old style.