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Torque time | 2017 GMC Sierra HD First Drive

It's not the truck that counts, it's how you use it. It's the heavy stuff you fit in its bed or the extremely heavy stuff that gets hooked up to the tow hitch. The ATV, the Jet Skis, the trailer with more square footage than a Greenwich Village apartment. Perhaps you need to get Seabiscuit or, uh, Mr. Ed to wherever they need to gallop next. In our case, there's a pair of very serious-looking snowmobiles perched atop the bed of a GMC Sierra. They spread out as wide as the extended tow mirrors, and their back halves are dangling precariously beyond the truck. Sterling Archer would be giddy; I'm a little nervous. But only because canyon roads and wide vehicles with a high center of gravity go together like peas and custard. The added weight is no sweat at all. That's because this is the 2017 GMC Sierra HD Denali, a truck with the sort of enhanced power, torque, suspension, and stopping capability expected of a heavy-duty pickup. And for this year, the power and torque get a serious bump courtesy of a new 6.6-liter Duramax turbodiesel engine reengineered from almost the ground up with 90 percent new parts. It's quieter and more efficient and it emits less, while most importantly producing 445 horsepower and 910 pound-feet of torque. That's up from 397 and 765, respectively. Chevy fans will note that the same engine is also available in the updated 2017 Silverado HD. Now, for those keeping score at home, that horsepower is best-in-class but the torque number still falls short of the new Ford Super Duty and its Power Stroke diesel V8's 925 lb-ft. Aw shucks. For the record, GM's engineers didn't seem too concerned that they weren't able to eke out an extra 16 torques just to say they're No. 1. "We wanted to first meet emissions and then deliver the maximum horsepower and torque we could, and deliver it over the widest usability range possible," said chief engineer Eric Stanczak. And let's be honest here, 910 pound-feet is herculean, and once again, a jump of 145 lb-ft. Or one Subaru Impreza's worth. Or 110 more than the best Ram can do on a 2500, and its Cummins turbodiesel's 800 pound-feet was eye-popping not too long ago. (The Ram 3500 maxes out at 900 lb-ft with the right transmission.) Ah, but here's the rub. That Cummins-equipped Ram 2500 can still tow more weight according to SAE-compliant measurements – 17,510 pounds for a Ram crew cab with a short bed versus 13,000 in the similar Sierra 2500. The Ford F-250 can manage 15,000.

2021 GMC Canyon AT4 Off-Road Performance Edition is ready to hit the trail

GMC introduced a more capable Canyon AT4 named Off-Road Performance Edition that gains modifications like skid plates and a beefier suspension. It can venture further off the beaten path, but it won't get there faster. Based on the AT4, which is already better suited to venturing into the woods than the standard Canyon, the Off-Road Performance Edition gains a taller suspension and loses its sizeable front air dam to offer a 30-degree approach angle. GMC knows adventurers will be tempted to put that figure to the test, so it also added skid plates made with 5/32-inch aluminum to protect the radiator, the front differential, the steering gear, and the oil pan. Full-length rock rails on both sides shield the rocker panels from expensive encounters with boulders and other obstacles. Finally, the Off-Road Performance Edition stands out from the AT4 with specific 17-inch wheels painted in gloss black, black AT4 logos, and black exhaust tips. 31-inch Goodyear Wrangler tires come standard. Changes in the cabin are limited to floor liners. Out back, the cargo box receives a spray-in liner. Don't look for Ram 1500 TRX-like performance, because it doesn't sound like GMC made any major mechanical modifications to the Off-Road Performance Edition. Power comes from a 3.6-liter V6 that sends 308 horsepower and 275 pound-feet of torque to the four wheels via an eight-speed automatic transmission and an automatic locking rear differential provided by Eaton. AT4 buyers can order a 2.8-liter Duramax turbodiesel four-cylinder with 181 horsepower and a stout 369 pound-feet of torque on tap for an additional $4,375, but there's no word yet on whether this fuel-saving engine will be available on the Off-Road Performance Edition, too. GMC's 2021 Canyon AT4 Off-Road Performance Edition will go on sale later in 2020, though pricing information hasn't been announced yet. For context, the standard AT4 costs $39,395 in its most affordable configuration.  

GMC introduces off-road performance package for Sierra AT4

GMC is giving its off-road-focused Sierra AT4 pickup even more performance with some factory-installed upgrades. The package is called the AT4 Off-Road Performance Package. With it you'll get the 6.2-liter V8 engine upgrade, cat-back performance exhaust system, performance air intake and 18-inch aluminum wheels shod in Goodyear Wrangler DuraTrac tires. The upgraded performance comes in the form of extra power. Thanks to the bolt-ons, you gain 15 horsepower and 9 pound-feet of torque over the 6.2-liter in stock form. This increases output to 435 horsepower and 469 pound-feet of torque — not too shabby. This package is priced at $4,940, and available for order now. That's a hefty price for what amounts to some minimal bolt-on modifications you could easily do yourself. However, buying it through GM means you get to keep your warranty in place. The Sierra AT4 already has more off-road features than a normal Sierra 1500. You're getting a two-inch lift, four-wheel drive with two-speed transfer case, locking rear differentials, skid plates, Rancho off-road shocks and hill descent control. Both the wheels and tires are available as options already, but this package just bunches related stuff together. It'll be up to you to decide if an exhaust and intake are worth the extra dough. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.