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.
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.
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.
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.
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:
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.
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.
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.
Standard on every new GMC - GMC Pro Grade Protection has you truly protected with features and
- Two maintenance visits
- 3-year / 36,000-mile Bumper-to-Bumper Warranty
- 5-year / 60,000-mile Powertrain Warranty
- 5-year / 60,000-mile Roadside Assistance & Courtesy Transportation
- 3-month trial of OnStar Guidance Plan with a suite of emergency security and diagnostic services
- 5-year OnStar Basic Plan
Front and Rear Park Assist provides distance alerts to nearby detected objects to help you park and avoid objects at low speeds.
Safety Alert Seat provides you the option of getting seat vibration pulses on the seat-bottom instead of beeps for crash avoidance alerts.