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1620 East Homer Adams Pkwy Alton, IL 62002

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2020 GMC Sierra 2500HD Denali OVERVIEW Overview Icon

2020 GMC Sierra 2500HD Denali in Alton

Redesigned with larger and bolder proportions (up to 2" taller, 10" longer and 1" wider than the previous generation), the purpose-built exterior of the Next Generation Sierra Denali Heavy Duty Truck pairs functional design with Denali-exclusive style.

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  • 6.6L V8 Direct Injection with Variable Valve Timing Gas engine
  • Autotrac® 2-speed transfer case with push button controls
  • Digital Variable Steering Assist
  • 8" diagonal Premium GMC Infotainment System with Navigation
  • Bose® Premium Sound System
2020 GMC Sierra 2500HD Denali Main Img

2020 GMC Sierra 2500HD Denali CONFIGURATIONS

* Model and trim configurations may vary
  • Sierra 2500HD Denali Crew Cab Standard Bed
    Sierra 2500HD Denali Crew Cab Standard Bed
  • Sierra 2500HD Denali Crew Cab Long Bed
    Sierra 2500HD Denali Crew Cab Long Bed

GMC Sierra 2500HD Denali Dealer in Alton

2020 GMC Sierra 2500HD Denali PERFORMANCE Performance Icon

2020 GMC Sierra 2500HD Denali performance

Allison® 10-Speed Automatic Transmission

The first of its kind in a heavy-duty truck in its class, the all-new Allison 10-speed automatic transmission features closer gear spacing that allows the engine to operate in an optimal range at all times with varying load and terrain conditions. This, combined with fortified components used throughout Sierra Heavy Duty’s driveline, provides maximum torque to the wheels at all times.

2020 GMC Sierra 2500HD Denali performance

Strong Foundations

A strong chassis and suspension are built upon a fully boxed, ladder-type frame built from high-strength steel using front hydroformed rails with clamshell design. The all-new frame and optimized body structure works in conjunction with larger driveline components1 that feature high-strength axles featuring larger ring gears (11.5" on 2500, 12" on 3500)2 to bring immediate torque to ground for increased power while towing and off-roading.

  • Off-road suspension
  • Twin-Tube Rancho® shocks
  • Eaton® locking rear differential
  • Underbody skid plates
2020 GMC Sierra 2500HD Denali performance

2-Speed AutoTrac Transfer Case

The first heavy-duty truck in its class to offer a 2 speed AutoTrac transfer case with an active automatic 4WD drive setting provides seamless shifting between two- and four-wheel drive based on road conditions.

2020 GMC Sierra 2500HD Denali APPEARANCE Appearance Icon

2020 GMC Sierra 2500HD Denali Appearance Main Img
2020 GMC Sierra 2500HD Denali appearance

Advanced Lighting

  • High-intensity LED headlamps
  • LED taillamps
  • LED daytime running lamps
  • LED fog lamps
  • LED cargo bed lighting
  • LED cargo lamp
  • Smoked amber roof marker lamps1
  • Wheel molding amber arch lamps over each wheel
2020 GMC Sierra 2500HD Denali appearance

Side Bed Step

The new standard Side Bed Step located just in front of the rear wheel arches complements the large CornerStep rear bumper to provide easier access when grabbing equipment from the cargo bed.

2020 GMC Sierra 2500HD Denali appearance

New Trailering Mirrors

Power-adjustable chrome capped trailering mirrors that power fold, extend and retract at the touch of a button. The door mounted mirrors feature the following lights to help improve visibility while trailering:

  • Heated and auto-dimming upper glass (driver and passenger)
  • Power extend/retract and fold
  • Lower convex mirrors
  • LED turn signal indicators/clearance lamps
  • LED perimeter lighting
  • LED rear guidance lamps
  • LED forward auxiliary task lighting

2020 GMC Sierra 2500HD Denali COMFORT Comfort Icon

2020 GMC Sierra 2500HD Denali comfort

Premium Comfort

  • Leather-wrapped heated steering wheel
  • Heated and ventilated leather-appointed front seats
  • Enhanced HVAC system with dual-zone climate control and rear-seat outlets
  • Heated rear outboard seating with nearly 3" of increased rear leg room (versus the previous generation)
2020 GMC Sierra 2500HD Denali comfort

Elevated Driver Seating

An elevated driver seat sits 1" taller than the previous generation Sierra Heavy Duty and offers cushions that provide support during long hauls and while towing.

2020 GMC Sierra 2500HD Denali comfort

Exclusive Interior Design

The durable Denali-exclusive interior features perforated Forge leather-appointed front seating and authentic open-pore ash wood, brushed aluminum trim, chrome accents and premium carpeted floor mats.

2020 GMC Sierra 2500HD Denali comfort

Available Rear Camera Mirror

One of the available 15 camera views Rear Camera Mirror is a dual-function mirror that can be used as a conventional rearview mirror or as a camera-based rearview mirror to help you see around potential visual obstructions inside the vehicle and cargo box.

2020 GMC Sierra 2500HD Denali SAFETY & WARRANTY Safety Icon

PRO GRADE PROTECTION

Standard on every new GMC - GMC Pro Grade Protection has you truly protected with features and services including:

  • 3-year / 36,000-mile Bumper-to-Bumper Limited Warranty
  • 5-year / 60,000-mile Powertrain Limited Warranty
  • 5-year / 60,000-mile Roadside Assistance & Courtesy Transportation
  • 3-year / 36,000-mile Corrosion Protection
  • 6-year / 100,000-mile Rust-Through Protection
  • First maintenance visit
2020 GMC Sierra 2500HD Denali Safety Main Img
2020 GMC Sierra 2500HD Denali safety

Front and Rear Park Assist

Front and Rear Park Assist provides distance alerts to nearby detected objects to help you park and avoid objects at low speeds.

2020 GMC Sierra 2500HD Denali safety

Safety Alert Seat

Safety Alert Seat provides you the option of getting seat vibration pulses on the seat-bottom instead of beeps for crash avoidance alerts.

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