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1620 East Homer Adams Pkwy Alton, IL 62002

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2015 GMC Sierra 3500HD Denali OVERVIEW Overview Icon

2015 GMC Sierra 3500HD Denali in Alton

Take one look inside the new 2015 GMC Sierra 3500 Denali HD and you’ll see clearly why this is the new standard in truck interiors. Sierra’s interior brings comfort, refinement, and convenience to a whole new level.

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  • Front full-feature leather-appointed bucket seats
  • Heated and cooled front row seating
  • SiriusXM® Satellite Radio
  • Dual-zone automatic climate control air conditioning
  • Power-adjustable pedals
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GMC Sierra 3500HD Denali Dealer in Alton

2015 GMC Sierra 3500HD Denali PERFORMANCE Performance Icon

2015 GMC Sierra 3500HD Denali performance

DURAMAX DIESEL 6.6L V8 TURBO

The advanced DURAMAX diesel in the Sierra 3500 Denali HD delivers 397 hp and 765 lb-ft of torque, making it the most powerful Sierra ever. The DURAMAX diesel engine has a strong reputation and a proven track record, with nearly 1.4 million sold since 2000. Paired with the sophisticated Allison® 1000 Series transmission with overdrive, this available powertrain also offers a maximum highway range of up to 680 miles on a single fill-up.

2015 GMC Sierra 3500HD Denali performance

DURALIFE® BRAKE ROTORS

This ferritic nitrocarburizing technology is a GM-exclusive patented process that hardens and strengthens brakes. Duralife® protects against corrosion and can double the life of the brakes compared to conventional rotors.

2015 GMC Sierra 3500HD Denali performance

ALLISON 1000 SERIES TRANSMISSION

The enhanced Allison 1000 is designed to handle the higher torque capability of the 6.6L DURAMAX engine, while also helping improve fuel economy and provide seamless assistance with the exhaust brake system.

2015 GMC Sierra 3500HD Denali performance

SUSPENSION

Sierra 3500 Denali HD delivers a smooth ride with a fully independent coil-over-shock front suspension and 3″-wide multistage rear leaf springs, which engage progressively as the load in the bed or the hitch increases.

2015 GMC Sierra 3500HD Denali APPEARANCE Appearance Icon

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2015 GMC Sierra 3500HD Denali appearance

UNMATCHED CARGO-BOX INNOVATION

The 2015 GMC Sierra 3500 Denali HD shows how our “Never Say Never” approach to engineering can transform working harder into working smarter.

2015 GMC Sierra 3500HD Denali appearance

AVAILABLE SPRAY-ON BEDLINER

With our high-performance bedliner, you can keep your Sierra 3500 Denali HD looking just as good outside as it does inside. It helps to protect your truck bed from scratches, dents, and corrosion by providing it with a durable watertight.

2015 GMC Sierra 3500HD Denali appearance

ATTENTION TO DETAIL

It’s the little things that set the new Sierra 3500 Denali HD apart, taking Denali style to an unparalleled level of refinement.

2015 GMC Sierra 3500HD Denali COMFORT Comfort Icon

2015 GMC Sierra 3500HD Denali comfort

A NEW STANDARD OF QUIET

Sierra 3500 Denali HD’s cabin is engineered to provide you and your passengers with a noticeably quiet interior. Features that help reduce cabin noise include:

- New inlaid door design
- Triple door seals which block outside noise
- Hydraulic powertrain and body mounts

2015 GMC Sierra 3500HD Denali comfort

CRAFTSMANSHIP

Detailed craftsmanship, driver-centric design, and quality appointments make the new Sierra 3500 Denali HD a cut above other trucks. Features include:

- Durable, soft-touch instrument panel materials and door trim
- Aluminum trim on instrument panel, steering wheel, and center console

2015 GMC Sierra 3500HD Denali comfort

COMFORT & CONVENIENCE

From the exceptional storage space in the center console to comfort and convenience features, Sierra 3500 Denali HD is designed to give you the comfort you deserve and the flexible functionality you need.

2015 GMC Sierra 3500HD Denali comfort

DENALI CUSTOMIZABLE DRIVER DISPLAY

The 2015 Sierra 3500 Denali HD puts absolute control at your fingertips. The standard reconfigurable 8″ diagonal display in the instrument cluster provides an intuitive way to customize your vehicle information and media displays.

2015 GMC Sierra 3500HD Denali comfort

CONNECTIVITY ANYWHERE YOU GO

OnStar® with 4G LTE™, now available on the Sierra 3500 Denali HD, elevates the connectivity of your Sierra Denali with an available Wi-Fi hotspot for a reliable connection that doesn’t drain your phone. Offering support for up to 7 mobile devices, it provides a more powerful connection than a smartphone or a mobile hotspot to keep you and your passengers connected to work, entertainment and more.

2015 GMC Sierra 3500HD Denali comfort

INTELLILINK

Standard on the Sierra 3500 Denali HD, with navigation and 8″ diagonal Color Touch Radio with next generation IntelliLink lets you customize your media and connect to your world. Features include natural language voice command, hands-free calling, and Bluetooth® connectivity.

2015 GMC Sierra 3500HD Denali SAFETY & WARRANTY Safety Icon

PRO GRADE PROTECTION

  • 3-year / 36,000-mile Bumper-to-Bumper Limited Warranty
  • 5-year / 100,000-mile Powertrain Limited Warranty
  • 3-year / 36,000-mile Corrosion Protection
  • 6-year / 100,000-mile Rust-Through Protection
  • 5-year / 100,000-mile Roadside Assistance
  • 2-year / 24,000-mile Maintenance
2015 GMC Sierra 3500HD Denali Safety Main Img
2015 GMC Sierra 3500HD Denali safety

SEGMENT-FIRST DRIVER ALERT TECHNOLOGIES

Sierra 3500 Denali HD’s advanced technologies pair intelligent engineering with driver-centric safety, using cameras or ultrasonic sensors to watch where you might not be looking. Sierra is the first pickup to offer this technology, which lets you know when you are approaching another vehicle too quickly or when you’ve left your driving lane.

2015 GMC Sierra 3500HD Denali safety

SAFE & CONNECTED: ONSTAR®

Standard on Sierra Denali models is a 6-month trial subscription to the OnStar®11 Directions & Connections Plan. The plan includes:

- Automatic Crash Response
- Turn-by-Turn Navigation
- Roadside Assistance

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