Mack Trucks is one of North Americaâ€™s largest manufacturers of heavy-duty Class 8 trucks, engines and transmissions. Founded in 1900, Mack trucks are sold and serviced in more than 45 countries worldwide. Every Mack© truck built for the North American market is assembled at its Mack Lehigh Valley Operations facility in Macungie, Pa. Engines and transmissions for the North American market are built at its powertrain facility in Hagerstown, Md. Mack is part of the Volvo Group, one of the worldâ€™s leading manufacturers of trucks, buses, construction equipment, marine and industrial engines.