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The 2024 GMC Sierra 2500HD AT4X and Extreme AEV Edition debut as the most off-road-capable models in the brand’s heavy-duty lineup.The AT4X boasts 35-inch mud-terrain tires, protective skid plates, and a jacked-up suspension with sophisticated spool-valve dampers.The Extreme AEV Edition’s add-ons come from aftermarket supplier AEV and include exclusive 18-inch wheels, stronger skid plates, and unique steel bumpers.All work and no play makes Jack a dull boy. That is unless Jack drives a 2024 GMC Sierra 2500HD AT4X or an Extreme AEV Edition, which together debut as the most off-road-focused models in the brand’s heavy-duty lineup. Able to tow up to 18,500 pounds and haul a payload of up to nearly 3300 pounds, the new AT4X and its AEV-enhanced counterpart are as capable as most other three-quarter-ton Sierras, but they also come with the necessary equipment to warrant some added fun when the workday is done.An Off-Road Semi TruckWhile the 2024 model year marks the first time GMC’s AT4X badge has appeared on a Sierra HD, the dirt-oriented model was introduced on the 2022 Sierra 1500. Previously, the heavy-duty pickup truck’s top off-road option was the regular AT4, which is offered on both the 2500HD and 3500HD. The new AT4X is only available on the 2500HD configured with the crew-cab body style and the standard-length cargo bed.View PhotosNothing to see here. Just a Sierra AT4X towing in the mountains.GMCThe Sierra 2500HD AT4X is outfitted similar to the recently revealed 2024 Chevy Silverado 2500HD ZR2. Both feature black 18-inch wheels wrapped with chunky 35-inch Goodyear Wrangler Territory M/T tires. The AT4X’s suspension is raised 1.5 inches, and the truck is buoyed by sophisticated Multimatic DSSV spool-valve dampers. Also found on professional race cars and trucks, these fancy shocks feature three separate spool valves that better help on-road composure and withstand off-road abuse.Other bits exclusive to the 2024 Sierra 2500HD AT4X include a revised front suspension with enhanced steering knuckles as well as unique upper and lower control arms. The bottom of the truck is also better protected from taking a beating thanks to the addition of an aluminum front bash plate and a larger steel skid plate for the transfer case. An electronically locking rear differential is part of the AT4X kit too, as is an Off-Road drive mode to help tackle tough obstacles.While four-wheel drive and an Allison 10-speed automatic transmission are mandatory, customers can choose between two powertrains: the standard 401-hp gas-fed 6.6-liter V-8 or the optional Duramax diesel 6.6-liter V-8, which makes 470 horsepower and an impressive 975 pound-feet of torque. An Extra Extreme AT4XWhat the AT4X and lesser heavy-duty Sierras don’t have is hardcore hardware that can only be found on the formidably named Extreme AEV Edition. With exclusive parts from aftermarket supplier AEV, it’s basically a further fortified version of the AT4X. The more extreme off-roader comes with steel-stamped front and rear bumpers that feature a winch accommodation and recovery points. Tougher underbody armor and a set of AEV-specific gloss-black 18-inch wheels complete the deal.There are some minor technical differences between the AT4X and the Extreme AEV Edition. Both versions have an identical 25.7 degree departure angle, and their ground clearance is virtually the same at 11.6—11.7 inches. However, the AEV has a slightly steeper breakover angle of 22.6 degrees (versus 21.2 degrees). On the other hand, the AT4X has a steeper approach angle (31.6 versus 29.8 degrees). The AEV add-ons also make it heavier, with GMC claiming the gas-fed version weighs 378 pounds more and the oil-burning one weighs 368 pounds more.With GMC giving the 2024 Sierra HD lineup a host of updates, including refreshed styling and a snazzier interior, the AT4X and Extreme AEV Edition reap the benefits. They also come with desirable content such as a 12.3-inch digital gauge cluster, a 13.4-inch center touchscreen, and a head-up display. Every model also has legitimate luxury features such as genuine wood interior trim, leather upholstery, massaging front seats, and a 12-speaker Bose sound system.The 2024 GMC Sierra 2500HD AT4X and the Extreme AEV Edition will start production sometime this fall. GMC hasn’t said how much either version will cost, but we expect a base price around $90K, with possibly an $8000 surcharge for the AEV-enhanced model.More on the GMC Sierra HDThis content is imported from poll. You may be able to find the same content in another format, or you may be able to find more information, at their web site.Senior EditorEric Stafford’s automobile addiction began before he could walk, and it has fueled his passion to write news, reviews, and more for Car and Driver since 2016. His aspiration growing up was to become a millionaire with a Jay Leno–like car collection. Apparently, getting rich is harder than social-media influencers make it seem, so he avoided financial success entirely to become an automotive journalist and drive new cars for a living. After earning a degree at Central Michigan University and working at a daily newspaper, the years of basically burning money on failed project cars and lemon-flavored jalopies finally paid off when Car and Driver hired him. His garage currently includes a 2010 Acura RDX, a manual ’97 Chevy Camaro Z/28, and a ’90 Honda CRX Si. More

Two fun-looking modified Porsche Cayennes are up for auction on Bring a Trailer this week.For racing fans, a 2009 Porsche Cayenne GTS with a Martini livery wrap looks more than ready for your social media feed.A modified 2008 Cayenne S looks more ready for your updates with a lower auction price. First-generation Porsche Cayennes around the world are enjoying an adventurous retirement from daily commuting as modified off-roaders from Dakar to your local desert-like area. If you’re looking for a way to join the movement with an already-modified 2008 or 2009 Cayenne, we found some options over on the auction site Bring a Trailer—which, like Car and Driver, is part of Hearst Autos.From the ArchiveUp first is a 2009 Porsche Cayenne GTS that looks like it should be speeding along the dunes. It has been modified with 18-inch OZ racing-style wheels, an aftermarket air suspension, a tubular front bumper, a front skid plate, and a roof rack with recovery gear. Don’t buy this one to blend in. It’s also got a multicolor vinyl wrap of the Martini livery over Crystal Silver Metallic paint, bi-xenon headlights, and a sunroof. The black leather interior uses Alcantara upholstery for the heated front seats. It also has navigation and a Bose surround sound system.Bring a TrailerBring a TrailerThe GTS Cayennes are a great place to start making modifications, but the listing doesn’t detail who made the modifications. The original 4.8-liter V-8 engine, rated at 405 horsepower and 369 pound-feet of torque at the factory, and a six-speed Tiptronic S automatic transmission remain. The Cayenne has all-wheel drive, a dual-range transfer case, and a variable center differential. There are 121,000 miles on the odometer. The auction ends on Wednesday, May 3, and the current bid is just over $18,000.Bring a TrailerA second modified Cayenne currently up for auction is a 2008 Cayenne S, the trim level below the GTS, in Sand White paint. Three inches of lift come from a Eurowise kit with Bilstein shock absorbers, and the car sits on 32-inch Falken tires (without tire-pressure monitors) with 18-inch Sparco Terra wheels. There are also bi-xenon headlights, a roof rack, a rear wiper, and a swing-away rear tire carrier. Bring a TrailerThe 4.8-liter V-8 and six-speed transmission should sound familiar. The interior is covered in Sand Beige leather and Gloss Light wood trim accents with heated front seats, navigation, and a Bose sound system.This vehicle has a few problems, including parking sensors and a windshield washer pump that do not work. There are also some scuffs and blemishes on the exterior. The front tires can rub the fender liners thanks to substantial front-end work. The odometer says the car has 121,000 miles, but it’s unclear how reliable that is. This auction ends on Thursday, May 4, and is currently sitting at $7000.If you’re more into the DIY aspect of modifying a Cayenne for off-road use, a fair number of them are regularly available on BaT. You can see all Cayennes on the auction site here.This content is imported from poll. You may be able to find the same content in another format, or you may be able to find more information, at their web site.Contributing EditorSebastian Blanco has been writing about electric vehicles, hybrids, and hydrogen cars since 2006. His articles and car reviews have appeared in the New York Times, Automotive News, Reuters, SAE, Autoblog, InsideEVs, Trucks.com, Car Talk, and other outlets. His first green-car media event was the launch of the Tesla Roadster, and since then he has been tracking the shift away from gasoline-powered vehicles and discovering the new technology’s importance not just for the auto industry, but for the world as a whole. Throw in the recent shift to autonomous vehicles, and there are more interesting changes happening now than most people can wrap their heads around. You can find him on Twitter or, on good days, behind the wheel of a new EV.  More

Last August, it was internal-combustion-engined passenger cars. Now it’s diesel-powered HD vehicles that won’t be allowed for sale in California after a future date. In this case, it’s 2036.Some fleets will need to start their transitions next year, but the zero-emission deadlines range from 2035 for last mile and short-haul deliveries, 2039 for things like garbage trucks, and 2042 for sleeper cabs and specialty vehicles.The California Air Resource Board (CARB)’s reasons for targeting the heavy-duty sector can be summed up in two numbers: big trucks comprise only 6 percent of California’s vehicles but emit 25 percent of all on-road greenhouse gas emissions.The Golden State continues to set the pace for clean-vehicle regulation in the U.S. This week, the California Air Resources Board (CARB) unanimously approved a new rule to phase out sales of diesel-powered medium- and heavy-duty vehicles by 2036. This is the first such combustion-truck sales ban in the world, according to the board.The rules, called Advanced Clean Fleets, will also require fleets that operate medium-duty vehicles, those with a gross vehicle weight rating between 8501 and 14,000 pounds, and heavy-duty vehicles (over 14,000 pounds) to shift to zero-emission powertrains. These MD and HD fleets have different deadlines for when their EV transition needs to be completed.California DreamingDepending on the type of HD vehicle and where it operates, the CARB rules take effect at different times. Last-mile delivery and drayage trucks—the short-haul vehicles that often operate around port locations—must be zero-emissions by 2035. Other categories have later dates: 2039 for local work vehicles like garbage trucks and day cab tractors and 2042 for sleeper cab tractors and specialty vehicles. The rules approved last week also require reduced emissions from train locomotives in California. As with CARB’s passenger-car emissions regulations, other states may adopt California’s new clean air rules. None have yet announced that they will do so.Trucks at the Port of Oakland (CA) in March 2023.Justin Sullivan|Getty ImagesLooking to Make Transition Easier for FleetsCARB has a history, over the decades, of providing financial incentives to make the clean vehicle transition easier, in this case for truck owners and buyers. Some plug-in trucks and buses are eligible for point-of-sale discounts, for example, and there are more local and municipal clean vehicle programs in California than just about anywhere else. CARB also allows for some exemptions when the best technology available for a particular vehicle type points towards upgrading that vehicle with a new, clean engine as the best choice. And the rules do allow fleets to “continue operating existing vehicles through their useful life.”No one who was paying attention to California’s recent greenhouse-gas regulation efforts should have been surprised by Friday’s diesel vote. Recent news about the big picture— how Gov. Gavin Newsom wants to turn all trucks in the state to zero-emission by 2045—and the small details should have clued people in.”Dirty Truck Detector” Days CARB adopted the Advanced Clean Trucks rule in 2020, which set the stage for requirements for manufacturers selling more zero-emission trucks. Last month, the EPA approved the state’s request for a waiver to implement to ban HD diesel vehicles, setting up last week’s vote. Last fall, CARB ran a series of “dirty truck detector” days along popular trucking routes in the state. And, while it’s not directly tied to HD vehicles, CARB voted last August to ban sales of new combustion-engine passenger vehicles in California starting in 2035.Go with the Current California has good reason to focus on dirty emissions from large vehicles. CARB said these heavy trucks are responsible for about 25 percent of on-road greenhouse gas (GHG) emissions but only make up six percent of the vehicles on California’s roads. The Advanced Clean Trucks rule aims to reduce California’s GHG emissions by 40 percent and reduce petroleum use by 50 percent by 2030. While there are obvious financial challenges to switching to zero-emission HD vehicles, CARB estimates that reduced truck pollution will result in over $26 billion in health savings while also reducing operating costs for fleet managers and truck owners by $48 billion by 2050. With all of the clean air projects in the works, CARB expects there to be around 1.7 million zero-emission trucks in California by the middle of the century.This content is imported from poll. You may be able to find the same content in another format, or you may be able to find more information, at their web site.Contributing EditorSebastian Blanco has been writing about electric vehicles, hybrids, and hydrogen cars since 2006. His articles and car reviews have appeared in the New York Times, Automotive News, Reuters, SAE, Autoblog, InsideEVs, Trucks.com, Car Talk, and other outlets. His first green-car media event was the launch of the Tesla Roadster, and since then he has been tracking the shift away from gasoline-powered vehicles and discovering the new technology’s importance not just for the auto industry, but for the world as a whole. Throw in the recent shift to autonomous vehicles, and there are more interesting changes happening now than most people can wrap their heads around. You can find him on Twitter or, on good days, behind the wheel of a new EV.  More

McLaren is readying a hybrid successor to the P1 supercar for 2026, according to a report from Automotive News.The hybrid system in the next flagship McLaren is said to be 70 percent lighter than the current setup found in the recently launched Artura.The report also claims that a four-seat McLaren will arrive in 2028, with a hybrid follow-up to the just-revealed 750S also coming in 2026.McLaren is prepping a successor to the groundbreaking P1 hybrid supercar from 2013 (pictured above), and a new report from Automotive News asserts the automaker’s next flagship will retain a hybrid powertrain instead of going fully electric.Succeeding the P1The information regarding the next Ultimate Series model came from a global retailer meeting that took place earlier this week at the automaker’s headquarters in Woking, England and reaffirmed McLaren’s hesitancy to jump headlong into EVs.The new model—described as a Formula-1-inspired two-seater—will pair a McLaren-developed V-8 engine with a new hybrid system. The dealer sources cited by Automotive News claim the system will be 70 percent lighter than the current hybrid setup, presumably referring to the battery and electric motor in the 671-hp Artura. The sources also revealed the new setup “produces much more horsepower and delivers the power more directly to the transmission.” The hybrid McLaren Artura.McLarenThe P1 successor will allegedly be based around a new carbon-fiber monocoque with built-in seatbacks like a Formula 1 car and will also feature aerodynamics inspired by the world’s premier open-wheel racing series. Other details revealed at the meeting include the car will have a new dihedral-door design and 3D-printed suspension components. The top-of-the-line McLaren is expected to debut in 2026.Possible Four-Door McLarenThe report also divulged other future plans for the British performance-car brand, including a potential four-passenger vehicle. McLaren executives are said to have hinted there will be “another class of automobile in 2028,” suggesting it could feature four doors and four seats. This tidbit follows quotes from last year that McLaren is considering a higher-riding vehicle, although the company wouldn’t commit to calling it a crossover. McLaren’s CEO Michael Leiters joined the company last year after working on the development of the Ferrari Purosangue and Porsche Cayenne SUVs. McLaren plans to keep the recently introduced Artura on sale until at least 2030, according to the report, although other variants will likely be added along the way. The automaker just launched the new 750S, a refresh of the 720S, that had been on sale since 2017. McLaren allegedly announced at the meeting that the 750S will be replaced by a new hybrid model in 2026, crucial to the company’s plans to electrify their entire lineup by that year. More details on McLaren’s hybridized future should come in the next few years.More from McLarenThis content is imported from poll. You may be able to find the same content in another format, or you may be able to find more information, at their web site.Associate News EditorCaleb Miller began blogging about cars at 13 years old, and he realized his dream of writing for a car magazine after graduating from Carnegie Mellon University and joining the Car and Driver team. He loves quirky and obscure autos, aiming to one day own something bizarre like a Nissan S-Cargo, and is an avid motorsports fan. More