GKN Rockford, Inc., through its subsidiaries, designs, manufactures, and markets heavy-duty powertrain components for off-highway applications. The company offers universal joints, drive shafts, and permanent and neck stub ends; C-type yokes, including brakes, flanges, couplings, end/fittings, slip yokes and assemblies, stubs, and welds; accessories, such as bolts, dust cups, hanger bearings, lock nuts, seals, slingers, slip sleeves, stuffing caps, washers, vents, and relief valves. It also provides fan clutches; and hydraulic products, including power shift clutches, power dividers, and torque converters. In addition, the company offers engineering/test lab services, including performance, endurance, destructive, and environmental testing. Its products are used in construction, agriculture, mining, forestry, military, industrial, recreation, and marine applications. The company offers products through distributors.