Profile: D. P. Mfg., Inc. manufactures winch gear box and load information systems. Our product line includes gear winches, worm gear swing/winch drives, mount and flange mount speed reducers. We produce planetary winches and digger derricks & truck mounted aerial devices. Our worm gear winches are installed on large oilfield trucks, heavy haul tractor packages, digger derricks and aerial work trucks. Our planetary swing drives are used in truck mounted and rough terrain cranes & utility digger derricks.