I work part time at AutoZone and have had a ton of happy customers with all years GM trucks using the Gabriel Pro Guard shocks. I put a set on my brothers 88 IROC and it made a heck of a difference in the stance and ride quality. Can't beat them for about 20 bucks a piece. I don't like the Monroe shocks very much. I have a set currently on my 74 (lowered) and my dad has the same ones on his stock-height 79 and we both don't care for the ride. They rebound a LOT. We went with the yellow ones, though, which I think are the cheap o's anyway. Just my 2 cents.