Someone correct me if I am wrong but I believe the 91 Subs, Blazers, Jimmys, 3/4 ton and up trucks were still straight axle with leaf spring front suspension. I always liked the older body style GM trucks better. BTW check the frame for cracks around the steering box and spring mounts. One of the biggest problems I have with the newer GM trucks is the frames hang down soo stinkin low on em. I call them "Rail Draggers" anytime some uneducated Shivy guy doesn't watch his mouth.