The 2025 GMC Sierra 3500 HD, available now at O'Fallon Buick GMC in O'Fallon, MO, offers a range of powerful engine options to tackle even the toughest jobs. With a 6.6-liter V8 gasoline engine producing 401 horsepower and 464 pound-feet of torque or the brawny 6.6-liter Duramax turbodiesel V8 cranking out an impressive 470 horsepower and 975 pound-feet of torque, the Sierra 3500 HD has the muscle to handle heavy payloads and trailers with ease.
The Sierra 3500 HD has six trim levels - SLE, SLT, AT4, Denali, Pro, and the luxurious Denali Ultimate. Configurations include crew cab, double cab, or regular cab paired with a standard bed or long bed, plus a choice of rear-wheel drive (RWD) or 4-wheel drive (4WD), allowing you to get the right truck for your needs. Innovative technologies like the Advanced Trailering System with in-vehicle apps, an available MultiPro tailgate, and up to 15 camera views optimize visibility and make towing a breeze.
Our team is ready to help you find the perfect heavy-duty pickup from our extensive new GMC inventory. Stop by our O'Fallon, MO dealership today for a test drive and see why the Sierra 3500 HD is the ultimate worksite companion.