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Redesigned 2021 GMC Yukon gets a diesel, AT4 model, Denali-exclusive interior

GMC's most robust family hauler is getting a complete redesign for the 2021 model year, including a new, off-road centric AT4 model, an upscale interior exclusive to its luxurious Denali model, an available air suspension, and, last but not least, a diesel engine.  With Americans obsessing over trucks, it's no surprise that GMC is going hard with its AT4s-for-everybody strategy; the Yukon is no exception. This will be the first model year for the new trim on GMC's largest SUV. This off-road model gets all the goodies you'll need to veer off the beaten path with confidence, including an extra 2.0 inches of ground clearance with the adaptive suspension option (more below), a two-speed transfer case, standard Goodyear all-terrain tires, an off-road mode for GMC's "Traction Select" drive mode system, hill descent control, and some extra underbody skid plates. Since GMC is a premium brand, even the AT4 gets some luxury appointments, such as a heated steering wheel, heated and ventilated front seats, and heated outboard second-row seats. The interior is also adorned in black leather with tan accents and "AT4" embroidery in the seat backs.  Speaking of premium, GMC will introduce an air-ride adaptive suspension with an off-road ground clearance mode as a late-availability option for several Yukon models, and this feature will be included on the Denali trim.  The Yukon and Yukon XL are GMC's variants of Chevrolet's full-sized SUVs, the Tahoe and Suburban. Their fundamental body-on-frame architecture is also shared with GM's half-ton pickup trucks, and thanks to that common engineering, they can also share powertrains. That's normally just a trivial side note when it comes to a new GM SUV announcement, but this time around, it's a bit more meaningful thanks to the introduction of a new light-duty, inline-six diesel in GM's truck lineup last year.  Yep, that means that for 2021, like the Tahoe and Suburban, the Yukon is getting a diesel option. The 3.0-liter Duramax makes the same 277 horsepower and 460 pound-feet of torque as it does in GM's trucks.  GMC's standard engine is still the 5.3-liter V8 that makes 355 hp and 383 lb-ft of torque. The 6.2-liter V8 is also an option like before, producing 420 hp and 460 lb-ft of torque. All engines come with a 10-speed automatic and a choice of rear- and four-wheel drive.

2017 GMC Canyon finally goes Denali

You knew this was coming and perhaps you've been waiting for it: the GMC Canyon dressed up in Denali trim. Even though we're getting to see it before its reveal at the LA Auto Show, you'll have to wait roughly one more year to take delivery since it doesn't go on sale until "late 2016." You can spec the trim on the crew cab models with either the 3.6-liter gasoline V6 or the 2.8-liter diesel engine. You know the formula, and it works well on the Canyon. There's a chrome grille, chrome trim around the foglights, chrome side steps, one polished exhaust tip, a spray-in bedliner, and 20-inch ultra-bright wheels. You can get the rest of the truck done up in one of six colors, two fewer than are available for non-Denali trims. The inside comes in Jet Black only, with heated and ventilated front seats, Denali badging, and a unique instrument panel. Check out the press release below for more info, we'll have live images from LA soon. GMC Introduces 2017 Canyon Denali Exclusive design cues, content elevate industry's first premium midsize truck DETROIT, Tuesday, Nov. 17, 2015 – Denali is the ultimate expression of GMC's professional grade style, luxury and capability – and it is coming to the Canyon midsize truck. The 2017 Canyon Denali is being introduced today, ahead of its public debut at the Los Angeles Auto Show. It goes on sale in late 2016. "Canyon is the segment's first and only premium midsize truck, offering unparalleled capability and efficiency matched with maneuverability and refinement," said Duncan Aldred, vice president of GMC Sales and Marketing. "The all-new Canyon Denali builds on that award-winning combination with the distinctive styling, luxurious interior and elevated content that has defined the Denali nameplate since its introduction nearly 17 years ago." Like all Denali models, the new Canyon Denali is distinguished with a unique chrome grille and unique wheels – 20-inch ultra-bright-machined aluminum wheels with painted accents. Exterior cues include chrome fog lamp bezels, five-inch-diameter rectangular chrome assist steps, a polished exhaust tip and a standard spray-in bed liner. The Canyon Denali will be offered in six exterior colors. Inside, a Jet Black interior features Mulan leather-appointed seats with perforated, heated-and-ventilated front seats – exclusive content in the Canyon lineup – along with unique instrument panel and console trim; and Denali-logo sill plates and floor mats.

Diesel Power finds the ultimate modified oil-burner

For nine years, Diesel Power magazine has run the Diesel Power Challenge, this year's grindfest being "a week-long torture test that features seven events, nine trucks, 8,000 horsepower, and nearly 15,000 pound-feet of torque." The road to being crowned "the most powerful truck" starts with a dyno run, and then continues through the completion of a CDL-style obstacle course, an eighth-of-a-mile drag race while towing a 10,000-pound trailer, a quarter-mile drag race without a trailer, a fuel economy test in the mountains and finally a sled-pulling test through a 300-foot-long packed-mud pit.
What kind of trucks get into such a fight? Last year's winner, for instance - who upgraded his truck this year to prove he didn't "luck into the win" - drives a 2008 Ford F-250 Super Duty with a 6.4-liter Power Stroke V8 upgraded with a custom intake, Elite Diesel triple turbos and a two-stage nitrous system. Another competitor has a 2005 Dodge Ram 2500 powered by a 5.9-liter Cummins inline-six, upgraded with Garrett turbos, dual-stage nitrous, a seven-inch exhaust stack and twin fans built into the bed to cool the Sun Coast Omega transmission. The numbers on that truck: 1,255 horsepower, and 2,063 pound-feet of torque at the wheels. Naturally, as the image above might suggest, things don't always end well.
You'll find all five videos covering this years challenge below. A scene in the dyno video sums it all up perfectly: a competitor leaves his nitrous on too long and the crew is treated to some ominous poppings, he leans out the window, throws both hands up and shouts, "Amer'ca!"