Chris, the front of the rear springs are just held up with a pin that goes through the spring eye and the bracket. To get the pin out there is a second retaining pin that holds it in on the bottom of the bracket. Take the nut off the retaining pin drive it out with a hammer, then beat the larger pin out and the spring should just fall out of the bracket.
http://chevy.oldcarmanualproject.com/gmc/5559mm/5559mm515.htmllook at picture B or D depending on 1/2 or 3/4 ton, they're both the same though. The fender and step doesnt necessarily have to be removed but it gives you a great deal more room. No special tool needed
