The 2008 Sierra Denali is a 4-door, 5-passenger luxury pickup, available in two trims, the Crew Cab Short Box RWD and the Crew Cab Short Box AWD.
Upon introduction, both trims are equipped with a standard 6.2-liter, V8, 403-horsepower engine that achieves 12-mpg in the city and 18-mpg on the highway. A 6-Speed automatic transmission with overdrive is standard.
The 2008 Sierra Denali is a carryover from 2007.