Four Wheel Drive name in 1910. Besserdich and Zachow's patented full time four wheel drive system combined a lockable center differential with double-Y constant velocity universal joints for steering. In modern terms the Battleship would be considered All Wheel Drive as all FWD products featured full-time four wheel drive with a lockable center differential. The success of the four-wheel drive in early military tests prompted the company to switch from cars to trucks. In 1916 the U.S. Army ordered 147 Model B three ton trucks for the Pancho Villa Expedition. The U.S. Army ordered 15,000 FWD Model B three ton trucks as the
Four-wheel drive for model years 2005-2009. Volvo introduced the Model 646 four-wheel drive backhoe loader in 1977. Case Corporation followed suit in the U.S. in 1987. In engineering terms, "four-wheel drive" designates a vehicle with power delivered to four wheel ends spread over at least two axles. The term "4×4" (pronounced "four by four") was in use to describe North American military four-wheel-drive vehicles as early as the 1940s, with the first number indicating the number of wheel ends on a vehicle and the second indicating the number of driven wheels. Trucks with dual tires on the rear axle and two driven