Hummer H1

The H1 was the civilian version of the AM General HMMWV (Humvee) military vehicle, originally launched 1992 and rebadged as 'Hummer H1' from 1999 when GM acquired marketing rights to the Hummer name. Site coverage is post-95 (1995-2006). Body-on-frame construction shared directly with the military Humvee. Engine progression: 5.7L V8 gas (1995-1996), 6.5L turbodiesel V8 NA in two outputs (1995-2000 indirect injection, 2001-2003 direct injection), and from 2006 the 6.6L Duramax LLY turbodiesel V8 (300 hp / 520 lb-ft) on the H1 Alpha — the most powerful and final variant. Four-speed automatic. Permanent four-wheel drive with two-speed transfer case. Available in three body styles: convertible-style soft top, four-door hard-top wagon, and two-door 'open-top' truck (slant back). Off-road capability was extreme — fording 30 inches of water, climbing 22-inch vertical walls, 60% grades, 40% side slopes. Final civilian H1 Alpha production ended June 2006 when 2007 emissions regulations made the diesel non-compliant; AM General continued building military Humvees through 2018. Total civilian H1 production approximately 12,000 units across 14 years. Now firmly collector territory — H1 Alpha models particularly, with their Duramax engine making them genuinely usable as well as historically significant.