GMC is not like a Chevy it's real different.
I use a Flywheel holder left over from VW days undo all the bolts leave two loose and POP the flywheel loose.....It weighs something and you don't want to catch it in your teeth!!
If it's really stuck get a couple longer bolts and put them in so you got some room for it to fly without falling......but I've never seen one stuck that bad
