The Hummer H1 is a civilian off-road vehicle based on the M998 Humvee, which was created by AM General produced from 1992 through 2006 and became the first of Hummer line. It was initially known only as the "Hummer", however, in 1999 in a joint venture between General Motors and AM General, GM began marketing the Hummer H2. The Hummer H1 shares some common driveline parts with its HMMWV brethren but Hummer H1s is unique in the way of handle in off roads. Hummer H1s have many unusual features such as inboard brakes and portal gears which allow the drivetrain half shafts a higher placement for greater ground clearance.
The "H1 Alpha" was an extensively re-engineered that was equipped with GM's Duramax Diesel and 5-speed Allison transmission. The engineering team chose the engine variant out of the GMT560 truck because it packaged better into the H1 engine bay. H1 Alfa on off road has much higher torque of the engine combined with a lower gearing ratio which made the truck much more powerful.
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