Idaho Falls GMC Dealer

GMC's heavy-duty Sierra models are the automaker's most capable trucks. The 2021 GMC Sierra 3500HD is the model to choose when you're looking for a pickup with the most capability. The Sierra 3500HD can be equipped with dual rear wheels that allow it to tow up to 36,000 pounds when properly equipped, with a payload capacity of 5,000 pounds. While the Sierra 3500HD is dedicated to work, you can get this truck in the top-line Denali trim at dealerships like the Idaho Falls GMC dealer and enjoy the utmost in comfort and sophistication.

Changes to the Sierra 3500HD for 2021 include a myriad of new and improved trailer-assistance equipment. There's a new jackknife alert system and a trailer length indicator that assists the driver in changing lanes with a trailer in tow. The SLE trim gets the Multipro tailgate standard. The Sierra 3500HD Denali now has a standard bed-view camera and a high-definition 360-degree camera. According to the Idaho Falls GMC dealership, a new Diamond Edition starts with the Denali's features and adds unique 20-inch wheels and power-retractable running boards. The off-road AT4 trim gets an available high-clearance step and mud-terrain tires.

Idaho Falls GMC Dealership

The automotive press gives the 2021 GMC Sierra 3500HD excellent reviews, with Edmunds writing:

"It really doesn't get much more capable than this. The 2021 GMC Sierra 3500HD is a truck that's made to work, even in its most well-appointed trims. ... You'd have to search hard to find a trailer or collection of equipment too heavy for you to pull or haul with this maxed-out Sierra."

The 2021 GMC Sierra 3500HD comes in regular cab, double cab and crew cab configurations. Buyers can get the Sierra 3500HD in five trim levels: Sierra, SLE, SLT, AT4 and Denali. Two engines are on offer: a 6.6-liter V8 producing 401 horsepower and 464 lb-ft of torque that's mated to a six-speed automatic gearbox and a 6.6-liter turbocharged diesel V8 developing 445 hp and 910 lb-ft that's paired to a 10-speed automatic.

The Sierra, SLE and SLT trims get standard rear-wheel drive. Those models get optional four-wheel drive, while the AT4 and Denali trims get four-wheel drive standard. Some models have a dual rear-wheel option that adds more towing capability.

Standard features for the base 2021 Sierra 3500HD include 18-inch steel wheels, LED headlights and taillights, a 40/20/40-split front bench seat, manual windows and door locks (regular cab), vinyl seats and floor coverings, manually adjustable trailering mirrors, a locking tailgate and spare tire carrier, a trailering hitch, and cargo bed steps. The infotainment system includes a 7-inch touchscreen and Apple CarPlay and Android Auto.

At the top of the lineup, the luxurious Denali trim includes 20-inch alloy wheels, chrome exterior trim, automatic high-beam headlights, premium leather seats, a power-sliding rear window, side steps, and a bed-view camera. Also standard is an upgraded driver information display, a Bose premium audio system, navigation and wireless charging.

The Denali trim includes safety and driver-assistance features such as lane departure warning, forward collision mitigation, blind-spot monitoring with rear cross-traffic alert, parking sensors, and a surround-view camera system. Several of these features are optional on the other trim levels.