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2024 GMC Sierra HD AT4X and Extreme AEV muscle their way into the lineup

The new AT4X variant of GMC's 2024 Sierra HD pickup series officially joins the stable this week, giving pickup truck box-checkers yet another off-road trim to chase. Well, two trims, technically, as GMC took the opportunity to announce that the AT4X will also be offered with an upfit package from American Expedition Vehicles, appropriately named the Extreme AEV Edition that takes its cues from the same package offered on the Sierra 1500 AT4X. And with its introduction, the 2024 GMC Sierra HD lineup is now complete.  GMC's Sierra AT4X models mirror the ZR2 packages offered on the updated Chevrolet Silverado. If you paid any attention at all to the Silverado HD ZR2's introduction earlier this month, you'll be familiar with the formula. Key upgrades include a 1.5-inch factory lift, standard electronic locking rear differential, Multimatic DSSV shocks and 35-inch Goodyear Territory all-terrain tires. It also gets beefier skid plates —  both the steel protecting the transfer case and the aluminum piece up front. With the updated 6.6-liter Duramax diesel, GMC says it'll tow up to 18,500 pounds.  "GMCÂ’s AT4X trim, which will be available across the entire GMC truck lineup, offers customers more premium and capable choices when it comes to ‘do-it-allÂ’ capabilities," said GMC VP Duncan Aldred. "Each model delivers unique strengths, with the all-new Sierra HD AT4X taking it to the max, enabling you to go virtually anywhere, with the towing power to bring your recreational toys, gear or camper along for the journey." And by "do it all," he means all the luxury stuff too, judging by the Obsidian Rush interior, which GMC says includes massaging leather front seats and real ash wood trim. The better from which to feel the shove of the AT4's two available 6.6-liter engines, one a gasoline-burner rated at 401 horsepower and 464 pound-feet of torque, the other a Duramax turbodiesel making 470 horsepower and 975 pound-feet of torque. You'll need the latter if you want to hit GMC's advertised towing capacity.  And don't forget the Extreme AEV Edition, which will surely come with a Denali-rivaling (and still TBA) price tag. The stamped steel bumpers stand out right away, as do the integrated front recovery points and winch mount. The package also adds more skid plates protecting the steering gear and transfer case. Its 18-inch "Salta" wheels are also unique.  GMC says it will be cranking out 2024 Sierra HD AT4Xs and Extreme AEV Editions by the third quarter.

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.

GMC Hummer EV range is 329 miles; deliveries in December

It'll be a very Hummer Christmas for some households, as General Motors says it will begin deliveries of the electric GMC Hummer pickup in December, according to GMC boss Duncan Aldred. And we now know the truck's EPA range number: 329 miles on a charge. GM had previously predicted the Hummer would achieve a range of 350 miles.  That 329-mile figure applies to the Hummer Edition 1, the top-of-the-line, $100,000-plus iteration that will be the first trucks off the line. The Edition 1 will also tow up to 7,500 pounds and carry up to 1,300 pounds. Aldred told reporters on a conference call that subsequent, less-pricey models will achieve longer ranges and will be along in 2023. GMC HUMMER EV View 7 Photos More than 80% of Hummer reservations are for the Edition 1, though. Aldred said almost half of the 125,000 people who have expressed interest in the Hummer have put down $100 to reserve one. GM has said the first year of Hummer production is sold out. The Hummer EV joins the Rivian R1T as the first electric pickups to market. Ford's F-150 Lightning rolls out in 2022, and other electrics from Detroit and startups are expected to roll out after that. Tesla is building a $1 billion facility in Austin, Texas, that will, among other things, build the Cybertruck, though timelines on that have come and gone. The Hummer, by contrast, was developed in just 18 months. It made a big splash last week when President Biden took the wheel during a tour of GM's Factory Zero assembly plant in Hamtramck, Mich. Biden gleefully demonstrated the acceleration of the four-ton, 1,000-horsepower truck, which is said to do 0-to-60 in 3.1 seconds. He then declared, "This sucker's something else." Next up for GM's EV push will be the Cadillac Lyriq SUV in 2022. The electric Chevy Silverado and GMC Sierra pickups will be revealed Jan. 5. And the SUV version of the Hummer will be introduced in 2023. Aldred expects the SUV to ultimately make up the majority of Hummer sales. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.