2020 GMC Sierra 3500 HD Denali Duramax: Evaluated on the Road and Route

The 2020 GMC Sierra 3500 HD Dualie flaunted 6.6 litres of Duramax diesel power and 2 even more tires in its rearend than common in our examination. See exactly how this dualie made out on- and off-road in the 2020 Pickup of the Year examination.

What’s Hot

Greater than 30,000 extra pounds of hauling ability
Downright shocking off-road chops
6L Duramax as well as 10-speed transmission produce a stellar combination

What’s Not

Superior inside can utilize a redesign

What’s New For The 2020 GMC Sierra Denali 3500 HD?


The GMC Sierra 3500 HD Denali is a land-dwelling tugboat moonlighting as an off-roader with a haul of 5,607 extra pounds as well as the ability to pull north of 30,000 when outfitted with a gooseneck. Our tester featured the acquainted LP5 Duramax giant, good for 445 horses and 910 ft-lbs of torque, as well as bolted to a newly revamped and also Allison-badged 10L1000 10-speed automatic transmission. Engineers tackled problems of heat generation and power loss in the transmission by bypassing the torque converter as well as, when Tow/Haul mode is selected, securing the trans in First equipment to obtain every foot-pound of the vehicle’s torque to the ground in demanding towing situations. Power is after that transmitted through the MP3025 transfer instance and also its Autotrac system, an “sector first” for the durable sector. Brawnier driveshafts relocate the power into the rear differential and its enormous 12-inch ring equipment prior to the double back wheels supply it to the ground.

Did We Bent The Dualie?

With an additional set of tires on the rearend, the 8,355-pound GMC Sierra 3500 HD Denali made its way up the 22-degree RTI ramp making it a score of 334.

Exactly how Rapid Does It Go?

The 6.6 L turbodiesel got its 445 horses as well as 910 lb-ft of torque to the ground, making the dualie the third-fastest truck of the lineup with a 0-60 time of 7.3 seconds. We covered the quarter mile in 15.7 seconds and hit 89 miles per hour in the process. After mashing the brakes, we got the gear pull back to a stop in 136.6 feet.

GMC clothed the Sierra 3500 HD’s interior in Walnut as well as Dark Ash Grey hues with bits of open-pore timber trim, meant to advise us of hand-planed furniture. Although we flinched at the idea of dirtying the immaculate upholstery, numerous were or else material spending time in the rig’s cabin, penciling comments like “it’s roomy as well as cozy” as well as “advises me of some squire’s study– it requires a fire place and also I need a monocle.” We were fans of the head-up display and also the design of digital assesses, though some courts noted their want a little assistance tipping up and into the Sierra 3500.

Freeway Efficiency

From the preliminary pulls while testing acceleration as well as stopping to the last all-day press back to world on the interstate, courts were constantly in awe of the Sierra 3500 HD’s comfort. “Sure flights smooth for a truck with 75 psi in all 6 tires,” is exactly how one court defined their experience after a prolonged pavement session. Steering and also braking were “far better than anticipated,” thinking about the size and one court composed, “it drives right like a rocket,” while an additional claimed, “certainly not luxurious however planted and secure.”

Power from the 6.6 L Duramax blended with the invisible changes through the Allison’s 10 gears inspired comments such as “pulls like a freight train” and “the power band is right where I want it.” Peering over the hood reminded us of the blindspot lying in front of the grille, however, with a peek at the forward-facing video camera, concerns of running across concealed things out front melted away. After a week when driving and tracks, we discovered that the dualie logged a combined gas economy of 14.4, not too shabby for a 1-ton.

Off-Road With The GMC Sierra 3500 HD Denali


Anyone with inquiries of “how will the dualie do off-road?” obtained an answer in a big means. “She’s a little bit broad in the hips,” wrote a court after maneuvering the 1-ton truck via a craggy canyon as well as over a rugged walk climb, but with that claimed, the Sierra 3500 HD went everywhere its solitary rear-wheel compatriots went, with some additional attention to the width of the additional wheels. While its 172-inch wheelbase, lack of complete skidplate insurance coverage, and also all-season tires did little to assist the truck off-road, judges noted that having two additional wheels on the ground seemed to assist push the vehicle along when going obtained harsh, albeit after massaging the throttle to involve the “often-more-than-fashionably-late-to-the-party G80 mechanical locker” in the back differential. In the sand, we provided the dualie higher marks on trip as well as convenience than a few of its rivals with committed off-road plans. “Sliced isn’t the word, steamrolled, probably?” is just how one judge described the 3500’s efficiency in the dunes. When ascending a gravel two-track with a slathering of slush, snow, and also mud, the truck climbed up considerably well prior to we even needed four-wheel drive. Nevertheless, the unsafe surfaces exposed the limitations of traction control. Going across rolling dips and also sharper drop-offs was “stealthily smooth” as well as “much much better than anticipated” while rippeds were the “Achilles’ heel” of the Sierra 3500.

Our Take

If your interpretation of job or play includes 15 heaps on the gooseneck as well as a rutted forest roadway, the Sierra 3500 HD Denali is your well-dressed workhorse with four-wheel-drive chops in its back pocket.

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