Following an extensive competition, AM General won the contract in 1983 to begin building the military's new High Mobility Multipurpose Wheeled Vehicle (HMMWV). The basic vehicle is the M998 and could be configured in either two- or four-doors. When supplied with a winch, the same vehicle is designated the M1038. The M998A2 series, introduced in 1994, had numerous improvements in the power train. The engine was now the 6.5-liter (400 cubic-inch) diesel, and the automatic transmission was now a four-speed unit rather than the three-speed previously used.
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