11/27/2025
This 2025 GMC Sierra 3500HD Denali is a heavy-duty luxury truck finished in bold Onyx Black over a rich Alpine Umber leather interior. It is powered by the mighty 6.6L Duramax turbo-diesel V8 paired with a 10-speed Allison automatic and four-wheel drive, delivering exceptional torque for the toughest towing and hauling jobs.
The Denali trim brings premium leather seating, heated and ventilated front seats, a large touchscreen with wireless smartphone connectivity, premium audio, and a full complement of trailering and driver-assistance technology.
Built to handle serious work without sacrificing comfort, this Sierra 3500HD Denali pairs maximum capability with upscale refinement.