The Willys MD, formally the M38A1 Truck, Utility: 1/4 ton, 4x4, or the G‑758 by its U.S Army Standard Nomenclature supply catalog designation, was a four-wheel drive, military light utility vehicle, made by Willys and Willys Motors / Kaiser Jeep from 1952 to 1971. It was widely procured by the U.S. military from 1952 until 1957, after which U.S. purchases were reduced to the U.S. Marine Corps. The Marine version had minor differences from the units used by other branches.
The MD was the first Willys jeep with a significantly restyled body, immediately recognizable by its rounded hood and fenders. It formed the basis for the civilian and commercial Jeep CJ-5, built for three decades (1954–1983), and subsequent models, and called the first 'round-fendered' Jeep. Although hard doors were still not available, the soft-top could be complemented with soft side panels and little hinged doors, that consisted of a thin steel frame with cloth and plastic window.
For the U.S. Army, the MD was replaced by the Ford M-151 jeep, from 1960. Low volume production of M38A1s for export to friendly foreign governments continued through 1971. Production totalled 101,488 units (80,290 domestic / 21,198 foreign sales). M38A1 jeeps saw extensive service during the Korean War, Vietnam War and several other conflicts.
The M38A1 / MD was the second post-war evolution of the World War II Willys MB jeep (after the M38 or MC; F engine Prototypes), and the first Willys Jeep to feature the new rounded fenders and hood body design that would become the distinguishing body style of the 1955 CJ-5, and which was carried through for decades on the CJ‑6, CJ‑7 and CJ‑8 Jeeps.
The M38A1's wheelbase grew by a single inch (2.5cm), and overall length by some 6 in (15 cm)
The M38A1 was the first Army jeep to use the Willys Hurricane F-Head 134 inline four engine. This engine was taller than the 'Go-Devil' engine that powered the WWII era jeeps and the M38, and was the reason for restyling the body over the higher power plant.
Otherwise, the MD had a T-90 3-speed transmission, Dana 18 transfer case, either the Dana 25 or the Dana 27 front axle, and Dana 44 rear axle.
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