2018 Gmc Sierra 2500 Denali on 2040-cars

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Supercharged 2015 GMC Yukon Denali sounds evil, runs 0-60 in 4.5 seconds

Speeding along in a sports car is undoubtedly a ton of fun, but some owners need the ability to carry a lot of people and their stuff and don't want to sacrifice the ability to put the power down. The tuners over at Hennessey have that demographic covered with their growling, supercharged power kits for the GMC Yukon Denali. The upgrades come in three forms for the SUV's 6.2-liter V8: HPE550 with 557 horsepower, HPE600 with 605 hp and HPE650 with 665 hp. This video showcases the full-bore version, and this Denali can definitely hustle in a straight line. The power bump comes courtesy of a 2.9-liter supercharger, intercooler and high-flow cylinder heads to add over 200 horsepower compared to stock, and the final result is a bellowing SUV that rears up off he line to throw the driver back into the seat. The sprint to 60 miles per hour lasts just 4.5 seconds. Check out this hasty hauler in action in the video above.

GMC shows how the 2022 Hummer could have looked even more futuristic

Excitement filled the room when GMC asked its designers to resurrect the Hummer in April 2019, but a tinge of uneasiness permeated the department after executives locked in an early 2020 unveiling date. Luckily, stylists knew what they wanted early on in the development phase, and preliminary design sketches give us a fascinating look at how they shaped the electric off-roader that ended up making its global debut online in October 2020. Hummer, the brand, unceremoniously shut down in 2010 after General Motors failed to sell it to the Chinese, but its design DNA was so strong that stylists were able to pick up where their predecessors left off. All of the sketches published on Instagram by the official General Motors Design account show a boxy truck with a tall front end, a short windshield, and a generous amount of ground clearance. These styling cues trace their roots to the AM General Humvee that entered production in 1984 and made its combat debut when the United States invaded Panama in 1989. Even the wildest drawings still depict a pickup that's immediately recognizable as a Hummer. Most of the early design sketches wear some variation of the seven-slot grille that characterized Hummer's production models; it's a styling cue that hints at a heritage shared with Jeep under the American Motors Corporation (AMC) umbrella. Oddly, none wear the round headlights seen on the H2, the H3, and the HX concept that nearly became the H4. Was GMC afraid that its Hummer would end up looking too much like a Jeep? And, at least one sketch shows a fold-down windshield, a feature that will not make it to the assembly line. Sketches never reach production without modifications made in the name of packaging and safety concerns, and the Hummer is no exception, but stylists did a good job of reinventing the brand's design language without copying or erasing the past. If the company had stuck around long enough to make a second- and a third-generation H2, odds are it would look a lot like the GMC-branded model that will enter production in a year. GMC remains on track to start 2022 Hummer deliveries in late 2021, though it told Green Car Reports that it still hasn't built a fully functional prototype yet. When it arrives, this outdoorsy pickup will land in a burgeoning segment of the truck market that numerous models (including the Rivian R1T and Ford's electric F-150) will also call home.

Fullsize GM SUVs have a problem that's making owners sick

Some fullsize SUV owners are getting sick, thanks to a buffeting and vibration problem in 2015 model year examples of the Chevy Tahoe and Suburban, Cadillac Escalade, and GMC Yukon. According to owners' complaints to the National Highway Traffic Safety Administration, the issue can vary from an annoying vibration inside the cabin to an experience so severe that it leads to dizziness and headaches. General Motors is aware of the complaints, but the fix isn't so simple. According to spokesperson Tom Wilkinson to Autoblog, the company "has been tracking this issue for a while." The problem has a fairly low incidence rate, but when it does occur the issue can be "uncomfortable and annoying for owners." There's no precise cause for the issue, Wilkinson claims, and in some cases, simply balancing the tires or changing the door seals can make it go away. However, not all of the fixes are so simple. AutoGuide dug deep into the problem and discovered a GM preliminary information bulletin that advised dealers to remove the headliner and to check the roof's bonds to the bows that go across the vehicle. However, that document included a note that the solution might not entirely eliminate things. According to AutoGuide, adding Dynamat insulation to the roof sometimes helped the problem. A GM spokesperson also told AutoGuide the company fixed the problem at the end of the 2015 model year, and didn't go into any more detail. This roof issue seems linked to some of the worst droning in these SUVs. According to one complaint from a 2015 Suburban owner to NHTSA: "Roof will not remain attached to the roof bows. This causes the buffeting similar to a window being down when all are up. The results span from annoying to painful." A 2015 Yukon owner claims to have another alleged cause for the problem in a NHTSA complaint from February 2015. This person brought their SUV to the dealer seven times over the course of four weeks for vibrations. The dealer replaced the driveshaft, suspension components, and more, but nothing worked. According to an engineer to the service adviser: "In an effort to prevent roll overs, they designed the frame and body mounts too stiff. There are 40 engineers working on issues, they have no solutions that work across the board." Wilkinson told Autoblog that GM is working with customers on an individual basis to rectify things. Since these are newer vehicles, dealers should also fix the problem under warranty.