ZF Group North American Operations (NAO) is the North American arm of German transmission, chassis, and driveline manufacturer ZF Friedrichshafen AG. ZF Group NAO makes driveline and chassis components for almost anything that rolls -- from passenger cars and light trucks to buses, heavy-duty trucks, and construction and agricultural equipment. Products include axles, steering systems, suspensions, and transmissions. It also specializes in transmissions for rail, marine craft, and helicopters. Aftermarket parts and service are offered, as well.