Man this truck I’ve been bringing back to life keeps fighting me. The belt keeps walking off. I had a new green gates belt that’s probably not in new condition anymore. When I put this engine together I put a new ac compressor, new idler pulley, new water pump, and new tensioner. Everything seems to spin straight and true. Within 10-15 seconds of running the belt walks halfway off the damper, power steering pump, fan, ac compressor and tensioner.