TM 9-803 Willys-Overland MB and Ford Model GPW Jeep Technical Manual

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Designated as a light truck, the Jeep served as the primary four-wheel drive vehicle for the U.S. Army during WWII. Its design was significantly influenced by Karl Probst, a freelance designer for the American Bantam Car Co., who created the prototype "Blitz Buggy" in just 49 days. Although the Army was impressed, the Buggy's engine did not meet specifications, and Bantam was unable to produce it in quantity. Consequently, the Army purchased the design and tasked Willys and Ford with improvements. The Willys model MB, featuring the L134 straight-4 "Go Devil" engine, was ultimately accepted as the standard. Ford's models, built to Willys specifications, were designated GPW. Despite common misconceptions, "GP" does not stand for "General Purpose"; the name "Jeep" likely derives from a character in Popeye cartoons. Approximately 640,000 Jeeps were produced during WWII by Ford and Willys, serving various roles including scout cars, ambulances, and artillery tractors. War correspondent Ernie Pyle regarded the Jeep as one of the "two most important pieces of non-combat equipment ever developed." The vehicle continued to serve in Korea and Vietnam. This technical manual, created in 1944, provides insights into the Jeep's design and capabilities, covering its engine, cooling, power, drive train, and other systems. Originally restricted, it has since been declassified and is reprinted here with integrity preserved.