The Hummer H3 is a vehicle from General Motors' Hummer division, introduced in 2006. The H3 is the smallest of the three Hummer models, and though the H3 concept car was a pickup truck, the final vehicle is a conventional SUV. Its GMT345 platform is based on the GMT355 which underpins the Chevrolet Colorado and GMC Canyon pickup trucks. The H3 is built at GM's Shreveport, Louisiana factory. Export versions will also be produced at the General Motors South Africa facility in Struandale, Port Elizabeth, South Africa. In the American market, the H3 is priced from $29,500 to just over $40,000.
The H3 uses the 3.7 L (3653 cc) Atlas straight-5 engine, the same engine that is used in the Chevrolet Colorado and GMC Canyon pickup trucks. This 20-valve DOHC unit produces 242 hp (180 kW) at 5600 rpm and 242 ft·lbf (327 N·m) at 2800 rpm. It is available with a 5-speed manual or 4-speed automatic transmission that includes GM's Stabilitrak vehicle stability control. Its 111.9 in (2842 mm) wheelbase is 1.1 in (28 mm) shorter than the GMT360 SUVs.
It includes an electronically-controlled dual-speed transfer case and electronic locking differentialThe H3 Alpha was introduced at the 2007 New York Auto Show as a new trim level for the 2008 model year H3. The Alpha package will feature a Vortec 5.3 L V-8 rated at 295 horsepower (224 kW) and 317 ft.lbf of torque (438 N·m), as well as platform enhancements to properly accommodate the V-8's increased size, weight, and power. Towing capacity is increased to 6,000 pounds (2,721 kg).
Introduced a the 2006 North American International Auto Show, the H3x is a trim update to the Hummer, among the additions were chrome and body-colored parts to differentiate it from the standard edition. The H3x trim package can be combined with the new Alpha package.