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Hummer was a brand of trucks and SUVs, first marketed in 1992 when AM General began selling a civilian version of the M998 Humvee. In 1998, General Motors (GM) purchased the brand name from AM General and marketed three vehicles: the original Hummer H1, based on the military Humvee, as well as the new H2 and H3 models that were based on smaller, civilian-market GM platforms.

The Hummer H1 is a four-wheel-drive utility vehicle based on the M998 Humvee, which was developed by AM General when it was a subsidiary of American Motors Corporation (AMC). Originally designed strictly for military use, the off-road vehicle was released to the civilian market.

The civilian version was produced from 1992 through 2006 and was the first of what became the Hummer line. AM General built both the H1 and the Humvee in its Mishawaka, Indiana, facility. GM stopped marketing the H1 in the 2006 model year, but AM General continued production of the military Humvee versions through 2018.

The Hummer H1 was available in three major variants: a convertible-like soft top, a four-door hard top Sport Utility Truck, and an “Alpha Wagon” body version. Less known variants were a two-door pickup truck and a four-door slantback, which shares the same body style as the Humvee employed by the U.S. Military. The convertible/soft top and the station SUV versions were the last types available to individual consumers.

There were five engine types and three automatic transmission types available. Typical engine/automatic transmission combinations included:

5.7 L (350 ci) L05 gasoline V8 TBI/GM 4L80-E 4-speed
6.2 L GM Diesel V8/GM TH400/3L80 3-speed
6.5 L GM Diesel V8/GM 4L80-E 4-speed
6.5 L turbo GM Diesel V8/GM 4L80-E 4-speed
6.6 L turbo Duramax LLY V8 turbo Diesel/Allison 1000 5-speed (model year 2006)

The Hummer H1 shares some common driveline parts with the HMMWV. These include brakes, axles, frame, and major body panels (hood, tailgate, and quarter panels) are shared between the HMMWV and Hummer H1. All H1s and HMMWVs were produced on the same assembly line; of which the civilian H1s were painted and finished in a separate building.

The H1 models feature a wide track. They can ford 30 inches (76 cm) of water and climb a 22-inch (56 cm) step. Stock ground clearance of 16 inches (41 cm) is due to the driveline components inside a channel in the wide central space between the left and right seats. Approach/departure angles are 72/37.5 degrees. A Central Tire Inflation System (CTIS) controls the tire air pressure allowing lower tire pressures for off-road and higher tire pressures on-road.

Other features include inboard brakes and portal gears to position drivetrain’s half shafts higher for greater ground clearance. The radiator is mounted high, sloping over the engine on a forward-hinged hood. The air intake is high, enabling the H1 to ford waist-level water. Options included magnesium-aluminum alloy or rubber inserts for run-flat tire ability. Other options include leather seats, a winch kit, and running boards.

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