Applies to establishments engaged in the manufacture or assembly of complete trucks. Truck manufacturers subject to this classification are the nonpassenger type vehicles such as semi-trucks. These establishments may manufacture the chassis, body and other truck components or they may purchase any of these items from other manufacturers and simply assemble the trucks. Usually they will purchase the axle assemblies, transmissions, electrical and cooling systems, and steering gears from others. The determining factor to assign this classification is that they do the final assembly of the various components to make the truck operational.

This classification excludes auto or passenger vehicle manufacturing including pick-up trucks which is to be reported separately in classification 3402; truck component manufacturing which is to be reported separately in the appropriate manufacturing classification; and semi-truck repair and service centers which are to be reported separately in classification 6409.