Used 2019 GMC Sierra 3500

The 2019 GMC Sierra HD is, as those last two letters suggest, the heavy-duty version of the regular Sierra half-ton pickup. Actually, it’s “versions” in the plural because there are the “2500” and “3500” variants, with maximum payloads rated at three-quarters of a ton and one full ton, respectively. These trucks are extraordinary machines, capable of towing, hauling and working at demanding levels. The optional diesel engine has an astonishingly muscular 910 lb-ft of torque, while the All Terrain X version is an off-roading rock star. Yet they can also be as comfortable and refined as a luxury SUV. The light-duty Sierra has been updated for 2019, but these heavy-duty models carry over from the previous year.

Since the 2019 Sierra HD is meant to work for a living, it’s set up to be at its most comfortable when there’s some appreciable load involved. That’s when it really impresses, making long highway stretches a breeze. General getting around is surprisingly easy and the well-equipped cabin is wonderfully tranquil — even when the big diesel engine is in the picture. Speaking of the diesel, hook up a 10,000-pound trailer, then haul it 6,000 feet uphill, and this engine won’t even break a metaphorical sweat. Trailer-sway control, a robust 6-speed Allison automatic transmission and the engine’s exhaust-brake system help to keep everything calm and composed on the way back down.

It’s hard to believe the Denali version is supposedly a work truck. From the inside, aluminum trim on the instrument panel, perforated leather seats with contrasting stitching, and a heated steering wheel convey the air of an upscale SUV. But even the most unadorned model doesn’t feel like drudgery, thanks to things like a 7-inch touch screen for the infotainment system, rearview camera, air conditioning, powered windows/locks, and a split-folding front-bench seat. The trim levels in between, SLE and SLT, pile on amenities like dual-zone climate control and power-adjustable pedals.

Imposing. But arguably handsome. It’s one of those vehicles where must-have elements — like the huge chromed grille, prominent air scoop in the power-domed hood, LED daytime running lights, and CornerStep rear bumper — harmonize to form a pleasing design. Regular-cab 2500/3500 models and the 3500 crew cab have an 8-foot bed. Double-cab versions offer the choice of 8-foot or 6.5-foot beds. Dual rear wheels are exclusive to the 3500.

INTERIOR
A mix of high functionality and deep luxury makes the Sierra HD a stand-out truck. One aspect exhibits large gauges and rubberized switchgear that can still be manipulated by a gloved hand, plus wide and comfortable seats. Another aspect enjoys features like wireless device charging, Wi-Fi and fine leather upholstery.

6.6-LITER DURAMAX ENGINE
“Duramax” is General Motors’ brand for its turbocharged 6.6-liter V8 diesel engine, which is one of the best in this class, endowed with a mighty 445 horsepower and 910 lb-ft of torque. The Duramax is also compatible with B20 fuel (20-percent biodiesel).

At its entry level, the new GMC Sierra HD comes with a sturdy gasoline-fed 6.0-liter V8, along with air conditioning, rearview camera, 17-inch steel wheels, Bluetooth, Apple CarPlay/Android Auto, and the mandatory safety features. Anything above the base 2500 HD also receives an automatic locking rear differential. Go up to SLE for a remote locking tailgate, carpeting and a leather-wrapped steering wheel. At the SLT level are leather upholstery, heated/power-adjustable front seats, power-folding mirrors and a 110-volt outlet. The top Denali trim has virtually everything the Sierra HD range offers, such as navigation, upgraded Bose audio, and 20-inch alloy wheels.

The main option, highly recommended, is the turbodiesel V8. Add all-wheel drive and the 2019 Sierra HD is equipped to meet a ton of challenges. A gooseneck adapter and a fifth wheel are also available for optimum towing talents. An array of driver aids can be had (forward-collision mitigation, lane-departure warning, etc.), as well as a rear-seat entertainment system. The All Terrain HD package brings black-finished 18-inch alloy wheels wearing all-terrain tires, Z71 off-road suspension and skidplates. Other extras include a snowplow-preparation package, and GMC’s Digital Power Assist power steering, improving stability and steering feel for less stress when hauling and trailering.

The standard engine for the 2019 Sierra HD is a 6.0-liter V8 running on gasoline. Or there’s a version that uses compressed natural gas (CNG). With 360 horsepower and 380 lb-ft of torque, the regular version is tough enough. The real power player, though, is the optional 6.6-liter V8 turbodiesel developing 445 horsepower and 910 lb-ft of torque. In common with many other big diesel engines, this one has an exhaust-braking feature, which is most welcome when driving downhill. Each engine option is connected to a 6-speed automatic transmission, but the diesel has one from the renowned Allison company. Rear-wheel drive is the default setup, with all-wheel drive as an option throughout. The Environmental Protection Agency (EPA) doesn’t provide fuel-economy estimates for this size of vehicle.

6.0-liter CNG V8
301 horsepower @ 5,000 rpm
333 lb-ft of torque @ 4,200 rpm
EPA city/highway fuel economy: N/A

6.0-liter V8
360 horsepower @ 3,000 rpm
380 lb-ft of torque @ 4,200 rpm
EPA city/highway fuel economy: N/A

6.6-liter turbodiesel V8
445 horsepower @ 2,800 rpm
910 lb-ft of torque @ 1,600 rpm
EPA city/highway fuel economy: NA