GMC Troubleshooting Questions? Ask a Mechanic for Answers
I am sorry for the long wait
you will need a steering wheel puller and a lock plat clip removal tool to push down the lock plate to remove the lock plate clip
once the wheel is off and the lock plate is removed there should be 3 Philip screw heads to remove and lift up the turn signal switch enough to remove the lock retaining screw and then the ignition lock cylinder will slide right out
here is a picture of the lack plate tool pushing down to remove the lock plate c- clip
how are you making out ?