GMC Sierra

The Sierra is the GMC full size pickup truck and the twin of the Chevrolet Silverado, the name GMC gave its full size line from the 1988 GMT400 architecture on, the line that reached its second generation for the 1999 model year and its sixth generation, unveiled in 2026. This site gives every generation and every model year its own page, in 5 generations: the second generation, GMT800, 1999 to 2006 (1999 to 2006); the third generation, GMT900, 2007 to 2013 (2007 to 2013); the fourth generation, K2XX, 2014 to 2018 (2014 to 2018); the fifth generation, T1XX, 2019 to 2026 (2019 to 2026); the sixth generation, 2026 (2026).