Newcor's core business is the production of metal, plastic, and rubber parts for the agricultural, auto, and appliance markets. The company's precision-machined products segment makes shafts, axles, and large iron and steel castings. Its rubber and plastics segment makes parts for auto and truck interiors and engine and body components. Newcor's special machines unit builds machines for welding and other processes for the appliance, auto, and general manufacturing markets. Makers of cars and light trucks account for about 70% of the company's sales; makers of agricultural equipment and heavy trucks account for the rest. Deere & Company and Chrysler are major customers. Holding company EXX controls Newcor.