A Free CARFAX for this vehicle is available at schompford.com, where you can view the vehicle history report, ownership history, and maintenance reports. Introducing the GMC Sierra HD AT4, a heavy-duty pickup built for drivers who want serious capability with a refined, off-road-ready attitude. This 4WD truck is powered by a 6.6L V8 diesel engine, delivering the strength and confidence expected from the Sierra HD lineup. With its rugged body-on-frame design and four-wheel-drive system, it is well-suited for demanding work, challenging terrain, and everyday driving alike. The AT4 trim brings a more adventure-focused character to the Sierra HD, blending premium details with practical utility. Inside and out, this truck is designed to offer a commanding presence and dependable performance. Standard equipment includes a backup camera, keyless ignition, LED headlamps, daytime running lights, adaptive driving beam technology, ABS, electronic stability control, traction control, tire pressure monitoring, and safety features such as front and curtain airbags, event data recorder, and automatic crash notification. Additional available safety technologies include blind spot warning, forward collision warning, crash imminent braking, lane departure warning, pedestrian automatic emergency braking, parking assist, rear cross traffic alert, rear automatic emergency braking, dynamic brake support, and semiautomatic headlamp beam switching. With its diesel power, 4x4 capability, and AT4 rugged styling, the GMC Sierra HD AT4 is a strong choice for buyers seeking a capable heavy-duty pickup with advanced safety features and a confident road presence. Please confirm the accuracy of the included equipment by calling us prior to purchase. Schomp Ford is proud to be recognized as a 2025 CarFax Top Rated Dealer. - Advertised pricing does not include applicable sales tax, title, registration, governmental fees, finance charges, emissions testing, or customer-requested transportation costs. A $33 VITU electronic title processing fee applies to Colorado transactions. Out-of-state finance and lease transactions may include applicable VITU processing fees, which vary by state, and a MavSign remote notary/signing fee starting at $285.