I have two GMC Pks Im presently driving. I like the rear leaf springs. One is a rough 6 cy LB with a factory granny 4 speed. the other is a short bed with a souped up 6 cy and powerglide. The Lb truck is the fleetside and my shortbed is a step side. I just woke up the old long bed it hadn't been started since 2000.been using it to haul stuff and pull trailers.