was produced starting in the 1946 model year, and U.S. sales ended in 1968. Export sales continued through 1978. The civilian Power Wagon continued the lineage of limited production Dodge 4WD trucks from the 1930s, that proved basic four-wheel drive design concepts, primarily for the military. Mechanically derived from Dodge's 1942–1945 3/4-ton WC series military trucks, the Power Wagon was introduced in 1946 as the first civilian production 4x4 truck. During its development phase, it was initially named the WDX General Purpose Truck, a name still used on some of the preliminary materials handed out by Dodge, before sales began in March 1946. The 'W' was a continuation of the 1941–1947 model year series, followed by a 'D' instead of a 'C', because the civilian truck was a 1-ton rating instead of the Army's -ton, and the 'X' was added to indicate four-wheel drive, as opposed to all previous civilian two-wheel driven models. Some believe the truck was renamed "Power Wagon" after a contemporaneous trucking magazine with that title. Meant to compete with military-based Ford/Marmon-Herrington and GMC trucks, it had an enclosed all-weather civilian cab and a purpose-designed 8-foot cargo box. It had a 126 inch (3,200 mm) up to a 147" wheelbase chassis and featured the 230 cubic-inch flathead inline-six engine, a 4-speed manual transmission, a two-speed 1.96-1 ratio low range transfer case for part time 4-wheel drive with a power take off (PTO) which would send power front or rear for operating auxiliary equipment, and 9.00/16-8 ply tires on 16×6.50 inch 5-stud split ring steel rims. In 1961 the 230 was replaced with the 251 cubic-inch flat head six. First Series: late 1945-50 Includes the following years and model numbers: 1945-47 WDX; 1948-9 B-1-PW; 1950 B-2-PW; Additional Distinguishing Features: (4) rectangular stake pockets on each side of the bed; round speedometer with a rectangular gauge cluster on each side. The two rectangular gauge housings have the instrument lettering on the glass instead of the face of the gauge. Second Series: 1951-(early)56 Includes the following years and model numbers: 1951 B-3-PW; 1952- early 53 B-3-PW; late 1953 B-4-PW; 1954 C-1-PW; 1955- early 56 C-3-PW; Additional Distinguishing Features: (3) slightly curved stake pockets on each side, bed sides are stamped. Looking at these bed sides from the rear, the top rail section of the bed angles out at 45 degrees with a rounded top edge. Group of 4 gauges in