The 2024 GMC Sierra 3500HD, part of the fourth generation, is a full-size heavy-duty pickup truck designed to tackle the heaviest loads. Equipped with either a standard 401-hp 6.6L V8 engine or an available 445-hp 6.6L Duramax Turbo Diesel V8 engine, this real workhorse has more than enough power for any task. Four-wheel-drive is standard across all trims. A six-speed automatic transmission is standard, while a ten-speed automatic is available. Available trims includes the SLT, AT4, and the luxurious Denali. Key safety features include forward collision warning, automatic emergency braking, and a rear-camera mirror. The infotainment system includes a standard 8-inch diaganol premium GMC infotainment System or an available 10.2-inch diagonal GMC Infotainment System, both compatible with Apple CarPlay and Android Auto. Notable for the 2024 model is the addition of Super Cruise, a hands-free driver-assistance technology, available on SLT, AT4 and Denali trims.