The 2005 GMC Sierra 2500 is a formidable heavy-duty truck, coming into its second generation. It offers two powerful engine options: a 6.0L V8 with 300 horsepower and a 6.6L turbodiesel V8 that delivers a hefty 365 hp. Transmission options include a five-speed manual, a four-speed automatic, or a six-speed automatic. This truck comes in four trims (Work, SLE, SLT, and Denali) with both two-wheel-drive or four-wheel-drive configurations. The infotainment system includes an AM/FM radio and a CD player, with selected trims offering OnStar capability. Safety features of note are dual front airbags and four-wheel anti-lock brakes, while extended cab models also include a rear-door safety lock. While more modern trucks offer more advanced tech and safety features, the 2005 Sierra 2500’s reputation lies in its power and durability.