In the mid 50s Autocar began to offer heavy-duty construction model which got the prefix OH to the index. The model range included two and three-axle tractors, chassis and dump trucks DC-7564-OH, DC-87-OH, DC-9564-OH, DC-9764-OH and DC-9964-OH.
All of them were equipped with diesel engines rated at 180-250 hp. There were also gasoline version C-87-OH which was available as a dump truck or tractor. OH series can be distinguished by large off-road wheels and steel angular front fenders.
Successor: Autocar DC / Construcktor
Autocar C / DC with all-steel cab
Autocar DC-6366 / DC-9966 / DC-10366
Autocar DC-6766 / DC-7366
Autocar DC-10064 / DC-10364 / DC-10564 / DC-20064 / DC-20364