The Hummer H1 is a civilian vehicle based on the High Mobility Multipurpose Wheeled Vehicle (HMMWV), popularly known as the Humvee, which was created by AM General.
Originally released in the civilian market in 1992, the Hummer H1 owes its birth to the popularity of photos from Operation Desert Storm and the enthusiastic campaign from actor Arnold Schwarzenegger, who personally owns several variants of Hummer vehicles. GM announced that 2006 would be the last model year for the Hummer H1 with production winding down in June 2006, due to a new emission laws for Diesel engine vehicles which take effect in 2007. No version of the Hummer H1 ever produced would meet these new standards. AM General currently has orders for an excess of 50,000 new HMMWVs to be produced between 2006-2009 for the United States Military. AM General also will continue to produce the H1, just not the Alpha. These vehicles will be sold through Fleet sales. The next H1 will most-likely bear a refined version of the prior 6.5L Turbo Diesel engine, but that has not been confirmed. Selling the H1's through fleet sales will allow the AM General to not be subjected to the new emission rules and regulations. AM General has sufficient fleet orders to produce 600-800 units per year right now.
The Hummer H1 has three common variants: a convertible-like soft top, a four-door hard top pickup truck and a Wagon body version. Other less known variants include a two-door pickup truck and a four-door slantback. At this time, the convertible/soft top and the station wagon versions are the only ones available in the mass market. The two door and four door pickup versions are only available in fleet livery.
Five engine types and three automatic transmission types can be found in Hummer H1s. The common engine/transmission combinations are:
* 6.2 L Detroit Diesel V8/GM TH400/3L80 3-speed
* 6.5 L Detroit Diesel V8/GM 4L80-E 4-speed
* 5.7 L Vortec 5700 gasoline V8 TBI/GM 4L80-E 4-speed
* 6.5 L turbo Detroit Diesel V8/GM 4L80-E 4-speed
* 6.6 L Duramax LLY turbo Diesel/Allison 1000 5-speed (model year 2006)