Hummer H1 Alpha Custom, Best, Biggest, Brutal Truck ever Hummer H1 Class Large truck/SUV Body style 4-door pickup truck Engine 6.2 L Detroit Diesel V8 6.5 L Detroit Diesel V8 5.7 L Vortec V8 6.5 L turbo Detroit Diesel V8 6.6 L turbo DMAX Diesel V8 Transmission GM TH400/3L80 3-speed automatic GM 4L80-E 4-speed automatic Allison 1000 5-speed automatic Dimensions Wheelbase 130 in (3,302 mm) Length 184.5 in (4,686 mm) Width 86.5 in (2,197 mm) Height 77 in (1,956 mm) Successor Hummer H2 The Hummer H1 is a civilian off-road vehicle based on the M998 Humvee, which was created by AM General. The vehicle was produced from 1992 through 2006, and was the first of what became the Hummer line. It was initially known only as the