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For 2021, the heavy-duty Sierra receives a host of new or improved trailer-assistance features. There's a new jack-knife alert that does what its name suggests and a trailer-length indicator that lets the driver know when nearby traffic might interfere with a connected trailer.
The Multipro tailgate is now standard on the SLE trim level and there are three new paint colors. The…
For 2021, the heavy-duty Sierra receives a host of new or improved trailer-assistance features. There’s a new jack-knife alert that does what its name suggests and a trailer-length indicator that lets the driver know when nearby traffic might interfere with a connected trailer.
The Multipro tailgate is now standard on the SLE trim level and there are three new paint colors. The Denali adds a newly standard high-definition 360-degree camera and a bed-view camera as well as a new Diamond Edition. The latter wears exclusive black 20-inch wheels and power-retractable running boards. Finally, the off-road-oriented AT4 is now available with mud-terrain tires and a high-clearance step accessory in used GMC sierra 2500 6.6L Duramax.
The Sierra HD comes standard with a gas-powered 6.6-liter V-8 that generates 401 horsepower and 464 lb-ft of torque. It pairs with a six-speed automatic transmission and rear- or four-wheel drive. The optional Duramax diesel 6.6-liter V-8 cranks out 445 ponies and 910 lb-ft of twist, and it works through an Allison 10-speed automatic.
ou can also specify either a single- or dual-rear-wheel axle (known as a “dually”). While we’ve only driven the diesel variant, we did sample the gas-burning powertrain on the internally identical Silverado 2500HD and appreciated its dutiful behavior in GMC Sierra 2500 6.6L Duramax.
However, there’s no arguing that the Duramax/Allison combination is a highlight of the heavy-duty Sierra, and it’s a no-brainer for those who regularly tow substantial loads. The engine is surprisingly refined, and the transmission is very responsive. Together they helped the 2500HD Denali we tested achieve impressively quick acceleration times. The gigantic GMC Sierra 2500 6.6L Duramax also has an agreeable ride quality for its breed.
Though its steering is vague at highway speeds the Sierra nonetheless feels more agile than its heavy-duty competitors. The trail-ready AT4 model is a more-rugged take on the commonly chrome-riddled rig, with an off-road suspension and a locking rear differential to go with its otherwise blacked-out aesthetic.
The strongest Sierra 3500HD can carry 7442 pounds in its cargo bed and pull as much as 35,500 pounds. However, those massive capacities require the diesel engine, regular cab, rear-wheel drive, and dual-rear-wheel axle. The GMC Sierra 2500 6.6L Duramax is only offered with a single-rear-wheel axle, and its burliest version is good for 3979 pounds of payload and 18,500 pounds of towing.
Inside, the GMC Sierra 2500 6.6L Duramax and 3500HD have a huge dashboard that hosts user-friendly switchgear. Most models have a split-folding front bench that can be replaced with a pair of bucket seats and a full center console. The Sierra’s interior can also be optioned with a class-exclusive head-up display, a heated steering wheel, heated-and-cooled front seats, and wireless charging.
Unfortunately, the cabin’s panel fits and material quality are mediocre at best. While there’s an abundance of soft touch surfaces throughout, and most models benefit from durable plastics, the top-of-the-line Denali falls woefully short of its luxury billing. The fanciest alternatives from Ram overshadow the GMC Sierra 2500 6.6L Duramax largely thanks to their significantly more upscale look and feel. Still, the Sierra HD will please pickup-truck buyers who prioritize practicality and versatility. Along with extensive passenger space in the crew cab, the GMC is littered with handy interior cubby storage.
Its standard and long cargo boxes have built-in steps on both sides of the bed and the rear bumper has them at each corner in GMC Sierra 2500 6.6L Duramax. The box can be further customized with LED lighting, movable tie-downs, and a 120-volt outlet. The heavy-duty Sierra’s biggest showpiece is its innovative multi-function tailgate, which has six different positions that include a work surface and bench. It’s a tailgater’s dream come true.