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Sir, I had to put the old belt back on. The steering squealed when turning, after we tried to replace the belt it squeals while driving while making the slightest turn. Before we tried to change the belt the engine is running, gave a little throttle and the pump would almost stop turning, yet the belt was not loose. So a later model 4.3 serpentine belt system wont work on my 1986 4.3 engine? I don't remember the belt # and the truck has AC. Routed the belt as original. I am grateful for your help. Muley