GMC Sierra Origins
The GMC Sierra is a lineup of full-size trucks currently manufactured by General Motors. It sells alongside its twin, the Chevrolet Silverado. General Motors earlier used the Sierra designation in its C/K pickup truck lineup, but its production halted in 1998. The GMC Sierra is also referred to as High Sierra, Sierra Grand, and Sierra Classic to differentiate between various trim levels in its C/K series. The older nomenclature continued well into 1999, when rear-wheel drive trucks contained the prefix C, and four-wheel drive trucks had the K prefix.About the GMC Sierra
The GMC Sierra is as one of the rare pickup trucks not entirely based on car design. It offers a luxury alternative to the utilitarian Chevrolet Silverado and the older Sierra trucks that preceded it. The idea of adding a touch of luxury to a workhorse-like pickup truck was ignored by other competitors.GMC Sierra Features
The 2012 GMC Sierra received its last significant redesign in 2007, and the 2012 model shows few visible changes. The powertrain varies between a 196 hp 4.3-liter V-6 engine and the more powerful 5.3-liter flex-fuel V-8 engine that delivers 315 hp. GMC also offers a mid-trim 302 hp, 4.8-liter V-8 engine variant. The flex-fuel engine uses cylinder deactivation to improve the mileage of the GMC Sierra. The highest end model of the GMC Sierra contains a 6.2-liter version of the same V-8 engine, which delivers 403 hp.
2012 also saw the continuation of the GMC Sierra Hybrid that uses a complex, two-mode hybrid drivetrain. In fact, the year witnessed many powertrain upgrades.GMC Sierra Evolution
The GMC Sierra series of pickup trucks was introduced with the launch of the GMT800 in 1998. It began production in 1999. During this time, the older C/K series trucks were still produced alongside the newer GMC Sierra series. The heavy-duty trucks from the older generation continued until 2000 when another GMC Sierra truck, the GMT800 Sierra HD, replaced them in 2001.
The GMC Sierra includes the 1500 series, which mostly consists of light-duty trucks. They come in three lengths: the two-door standard cab, the 3- or 4-door extended cab, and the front-hinged four-door cab. The cargo bed is also available as a short bed, standard bed, or long bed. However, the short bed only comes with the crew or extended cab models.
In 1999, GMC only made a three-door extended cab and a two-door regular cab version. The Vortec 4.3-liter V-6, 4.8-liter V-8, and 5.3-liter V-8 power these models. The four-door version became available in 2000. In the same year, the output of the 5.3-liter engine boosted to 285 hp and 325 lb-ft of torque.
GMC added the 6.0-liter Vortec V-8 engine to the Sierra powertrain in 2000. This engine delivers 300 hp, and the GMC Sierra C3 truck has an updated version of the engine.
The company reworked the GMC Sierra slightly in 2003 to get a better front and rear end, although the difference is not very evident. The GMC Sierra series also offers a Heavy Duty (HD) range of trucks that includes the 1500 HD, 2500 HD, and 3500 HD. This range of trucks debuted in 2001 along with the launch of the GMC Sierra 1500 HD. All HD trucks provide strengthened forms of the light-duty trucks. The 1500 HD offers a 6.0-liter Vortec V-8 engine, while a Duramax diesel V-8 engine powers the 2500 HD. All HD versions of the GMC Sierra have another option—the 8.1-liter Vortec V-8 engine. The 2500 HD model specifically has a five-speed Allison 1000 transmission system, which is also present in the GMC Sierra 3500 HD model. Other similarities between these models include the engine and transmission systems. However, the 3500 HD comes equipped with dual-twin rear wheels and a stronger axle and suspension. The GMC Sierra HD models prove useful for towing heavy cargo.
GMC redesigned the Sierra in 2007 to feature new exteriors, interiors, suspension system, and frame. The engines in these trucks also prove more powerful. The performance of the GMC Sierra from 2007 onwards shows notable improvement due to the new aerodynamic elements. Some of these elements include steeply-angled windshields and tight-panel gaps. The new aerodynamics of the GMC Sierra series also improves its fuel efficiency.