The 2021 Sierra Heavy Duty pickup truck offers up to 36,000 lbs of max towing. It’s built strong so you can tow strong. Its large drive shaft and rear axle will give you increased durability and strength. And its improved brakes and steering offer superior control.
The 2021 Sierra Heavy Duty truck features advanced engines and transmissions that power a confident driving and trailering experience:
Sierra is the first heavy-duty truck in its class to offer a 2-speed AutoTrac™ transfer case with an active automatic 4WD setting, which provides seamless shifting between two- and four-wheel drive based on road conditions.
Open the primary gate using the key fob’s power release from inside the truck or from a button on the gate.
With the primary gate open, the load stop can help prevent items from sliding out of the bed.
The inner gate folds down for easy access when loading and unloading the bed.
The Bose Premium Sound System supplies seven well-placed speakers to produce powerful, high-quality concert-like sound wherever you go.
Standard on every new GMC - GMC Pro Grade Protection has you truly protected with features and services including:
Uses a brief, gentle steering wheel turn to alert you when you may be unintentionally drifting out of detected lane lines, so you can steer to stay safely in your lane. If needed, you may receive additional Lane Departure Warning alerts. System alerts do not occur if you’re using your turn signal or it detects that you are intentionally leaving your lane. Available on SLE, SLT and AT4. Standard on Denali.
Front and Rear Park Assist provides distance alerts to nearby detected objects to help you park and avoid objects at low speeds. Available on base Sierra HD, SLE, SLT and AT4. Standard on Denali.