The 2021 GMC Sierra 2500 is a robust heavy-duty pickup truck, available in both rear-wheel drive and four-wheel drive. There are five trims on offer, ranging from the work-ready base Pro to the ultra-luxurious Denali. The base model gets a 6.6L V8 engine delivering 401 hp, with an optional 6.6L Duramax turbodiesel V8 that generates a powerful 445 hp and a whopping 910 lb-ft of torque. Both engines are paired with a heavy-duty 6-speed automatic transmission. Notable technologies include the class-leading 15" diagonal Head-Up Display and Rear Camera Mirror. Key safety features include lane departure warning, forward collision alert, and automatic emergency braking. It also features a premium Infotainment system complete with Apple CarPlay and Android Auto integration