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GMC Sierra Denali CarbonPro bed is finally, almost here

GMC revealed the Sierra 1500 with the optional CarbonPro bed on March 1, 2018. The bed wasn't available at launch, though. You can't buy it now, either, but it will hit dealerships with limited availability after production starts in early June, exclusively for the Denali 1500 and AT4 1500 trims. The carbon floor and sides replace the steel panels in a normal bed, providing "strength, durability, and scratch resistance" and a potential 59-pound weight saving, depending on the truck's configuration. To make sure the bed had a chance, development engineers replicated "extreme use scenarios" like dropping 1,800-pound gravel loads, 450-pound steel drums, and cinder blocks from various heights. They put a 250-pound man on a snowmobile with studded tracks, had him drive into the bed and then go wide-open throttle. We're told the result was "minimal scratching." On top of the extreme weather testing any vehicle goes through, the team also put a generator in the bed and aim the exhaust into a corner to ensure vibration and direct heat wouldn't deform the carbon fiber. Because of the finer shaping area-specific strength possible with carbon fiber, the bed provides one cubic foot of additional payload space by having its sidewalls pushed further out. The CarbonPro bed doesn't need a bedliner, and is grained at the top for better traction but smooth on the bottom for easier hosing down and dirt removal. Tie-downs at the front of the bed work with molded indentations to hold motorcycle tires, and slots in the sidewalls hold two-by-sixes. The truck maker says the carbon-lined payload area confers "best-in-class dent, scratch and corrosion resistance," but we suppose the nation's pickup truck army will prove that or not. The trucks likely won't have the hardest life at the start, since the Sierra Denali costs $56,790 before even a basic option like four-wheel drive. The real test probably won't come until around 2029, when third owners begin treating their aerospace-inspired thoroughbreds like dray horses.

2024 GMC Canyon AT4X AEV teased on 35-inch tires

Last month, Chevrolet Performance teased the 2024 Colorado ZR2 Bison, which will be the ultimate hardcore off-road variant for that model developed in collaboration with American Expeditionary Vehicles (AEV). Since that camouflaged preview appeared, we've welcomed debuts of the competition, the 2024 Ford Ranger Raptor and 2024 Toyota Tacoma TRD Pro. Bookending a solid month of 4x4 delights, GMC teased the coming 2024 Canyon AT4X AEV. We can look at this as the GMC version of the Colorado ZR2 Bison, the Canyon's new-for-2024 AT4X trim given an additional boost in spec and capability. This isn't the truck's first flirt with the public. During media drives for the 2024 Sierra HD AT4X, one of the new heavy duty rigs showed up to the site pulling a trailer bearing a covered pickup. The mid-size form factor, 35-inch tires, and appearance at a GMC event were clues enough to the pickup's identity.  The official preview is proof of what we've been expecting. The revised front fascia wears a high-clearance bumper. Don't expect that winch to be included; the red hook in the tease is a digital add-on. You can expect the winch opening, boron steel underbody skid plating, and Multimatic dampers. The standard AT4X got a three-inch lift over the non-hardcore Canyon variants, in part thanks to being fitted with 33-inch tires. The 35-inch Goodyear Wrangler Territory MT 315/70 17 tires on the AT4X AEV are thought to help provide 11 inches of ground clearance. Beefier wishbones and hydraulic bump stops help protect owners who want to test limits. Reports by folks who walked around the covered truck predict a set of beadlock-capable AEV Salta wheels like the kind sold with the full-size Sierra AT4X AEV Edition. The cover couldn't hide the sport rack in the bed nor the bed-mounted spare tire carrier. Those, like the winch, are likely options that add to the price. Don't be surprised if engine output is unchanged. The 2.7-liter H.O. turbocharged four-cylinder makes 310 horsepower and 430-pound feet of torque. We'll never complain about more, but that's plenty for a truck envisioned as a low-speed obstacle crosser.  All GMC is saying for now is, "An even more off-road capable Canyon is coming." It debuts on July 6. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).