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The M998 is the base HMMWV configuration — a cargo and troop carrier in open top and soft top configurations. The foundational platform from which all other HMMWV variants are derived. Powered by the 6.2-liter and later 6.5-liter Detroit Diesel V8 engine with a 3-speed GM TH400 automatic transmission. The M998 series designation covers a broad family of variants including the M998 cargo, M1025 and M1026 armament carriers, M1035 soft top ambulance, M1037 shelter carrier, and others. The most commonly found HMMWV configuration in the surplus civilian market.

The M1097 Heavy Variant HMMWV and M1113 Expanded Capacity Vehicle are uprated versions of the base HMMWV with higher GVW ratings — accommodating heavier payloads, additional armor packages, and more demanding mission requirements. The M1113 uses the turbocharged 6.5-liter Detroit Diesel producing approximately 190 HP. GVW of up to 13,500 lbs on fully armored configurations. These heavy variants were developed in response to the HMMWV’s vulnerability to IEDs in Iraq — additional armor substantially increased vehicle weight beyond the original M998 design limits.

The HMMWV is available in more than 15 configurations covering virtually every light tactical vehicle role in the U.S. military. Key variants include the M997 and M1035 ambulances, M1025 and M1026 armament carriers (with ring mount for heavy weapons), M1043 and M1044 armament carriers with supplemental armor, M1044A1 with TOW missile system, M1037 and M1042 shelter carriers, and various electronic warfare and special mission variants. Surplus examples from all configurations regularly appear in government auctions — DRMO (Defense Reutilization and Marketing Office) sales, online government surplus auctions, and private dealers.

The civilian Hummer H1 was produced by AM General from 1992 to 2006 — a street-legal, DOT-compliant version of the military HMMWV with a full 17-digit VIN, proper lighting, seatbelts, and emissions controls. Only 11,818 were built over 14 years — making every H1 a relatively rare vehicle. Available in four body styles: Open Top (HMCO), Hard Top/Wagon (HMC4/HMCS), 2-door Fleet (KSC2), and 2-door Pickup (XLC2). Powered by the 6.2L Detroit Diesel (1992–1995), 6.5L naturally aspirated Detroit Diesel (1996–2000), 6.5L turbodiesel (2001–2002), and the 6.6L Duramax turbodiesel (2002–2006). General Motors purchased the Hummer brand name in 1999 while AM General continued manufacturing. GM stopped marketing the H1 after 2005 but AM General produced a final 2006 run. All H1 configurations command significant collector premiums.

Early Hummer H1 production from 1992 through approximately 2002 used the GM/Detroit Diesel V8 diesel engine family — the 6.2-liter naturally aspirated through 1995 and the 6.5-liter in various states of tune through 2002. These early H1s used the GM TH400 3-speed automatic and later the 4L80-E 4-speed automatic. The pre-Duramax H1s are the most commonly found in the used market and have a devoted following among off-road and overland enthusiasts who prefer the simpler, more wrench-friendly powertrain. Parts availability for the 6.2L and 6.5L engines is strong through GM diesel parts suppliers.

The Duramax-powered H1 — introduced for the 2002 model year with the 6.6-liter LB7 Duramax turbodiesel paired with the Allison 1000 5-speed automatic — is considered the most capable and desirable H1 configuration. The Duramax provides significantly more power and torque than the older 6.5L Detroit, dramatically improving the H1’s highway performance and towing capability without sacrificing off-road ability. The LLY Duramax followed for later production. Final model year was 2006. Duramax H1s command a substantial premium over earlier examples in the collector market.