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How do you change the door hinge pins and bushings on a 2002 GMC 1500 pickup truck?"
You probably don't need to change the pins, just the bushings (unless you let the bushings wear through to the pins). If you need to replace the pins (or bushings), first you need a stool or crate (to set the door on) or someone to help you, since the door is surprisingly heavy. Next, hammer a tap (or a Flathead screwdriver) onto the bottom of the pin until it is free (falls out). You may need a Flathead screwdriver or chisel to pry the bushings out of the hole Replace the pin and bushings. Check the pins for wear, and if there is none, put them back. It seems like an ordeal, but it is actually pretty mechanical and simple.
Look here http://www.hotrodders.com/forum/99-tahoe-door-pins-136678.html
these pins need to be cut to get them out once cut they can then be knocked out and new pins and bushings installed the hardest part is cutting the old ones i have used a metal bladed Sabre saw to get the reach with out moving actual hinges
go to any auto store and buy new pins and bushings. open door, cut off pins. knock out the pins that are left after cutting. intall new bushings, then new pins,most times this can be accomplished with out removing hinges
link pins. bushings and links Stabilizer link bushings.
Have to remove the door, then remove pins and bushings
From what I was told, from the guy at the auto store, you can't. You have to replace the entire bracket.
If the door is not lining up correctly it is probably the pins and bushings are worn out. Replace the pins and bushings and the door should close correctly. Pin and bushing kits are available from your local auto parts store.
You replace the truck ...it comes with new hinge pins :((
I've worked for GM for over 10 years. Look at your door hinge pins and bushings first, they are probably wore out. To tell if the pins and bushings are worn out, open the door and lift up on it from the end opposite the hinges. If the door has any play at all the pins/bushings are worn. If you let them go too long the holes in the hinge wear the bushings sit can get wallered out.
Replace the hinge pins and bushings.