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Where the 2023 GMC Sierra AT4X fits into the hierarchy of off-road trucks

The world of off-road pickups sure seems like it's getting crowded, but the reality is that half-ton trucks were always pretty capable, even with what seemed like fairly basic 4x4 packages. It wasn't until recently that manufacturers really started to carve out different off-road niches for their mainstream pickup offerings. With the introduction of the 2022 GMC Sierra 1500 AT4X (alongside its mechanical twin, the Chevy Silverado ZR2), the crowd has grown even thicker. Even we have trouble keeping up with the increased segmentation of off-road pickup trucks, so we threw together this handy guide to help you understand just where these various packages fit into the broader pickup hierarchy. Let's dive in.  Your basics If we say "Z71" or "FX4" to you, both will probably ring a bell. That's because they've been around a few days short of forever and their respective customers have grown so used to these package codes that OEMs got into the habit of just plastering them on the side of so-equipped truck beds. Anybody who sells a pickup truck offers some sort of basic off-road prep package like this one. Z71 is found on GM vehicles; FX4 is Ford's. Ram just calls it "Off Road Group," but no matter what you call them, they're all pretty similar.  Typical upgrades for this category include some additional ground clearance, a basic all-terrain tire, heavy-duty suspension upgrades and likely either a limited-slip or locking rear differential. These are pretty handy for anything beyond a rutted dirt road. On newer trucks — especially on higher trim levels — you'll probably also get some dedicated off-road drive modes.  Mid-range This is where things start to get interesting. To qualify for this category, a locking rear differential is a must. Most of the names in this segment are well-established too, though some (Nissan Titan Pro-4X, anyone?) may not necessarily be on your radar. The Toyota Tundra TRD Pro checks in here, as does the Ram Rebel, Chevy Silverado Trail Boss and GMC Sierra AT4 (no X!).  Realistically, if there's somewhere you need to go and one of these trucks won't do it, you might want to consider a helicopter. But it's 2021, and our thirst for capability is strong, so of course, there's a way to spend more of your money on this type of thing. Onward! Entry-hardcore Here we are, the home of the new 2022 GMC Sierra AT4X and Chevrolet Silverado ZR2. This is a tiny niche, otherwise occupied only by the Ford F-150 Tremor.

Chevy's 6.6-liter Duramax is pretty much all new

To say there's a heated battle in heavy-duty pickups is an understatement, with Chevrolet, Ford, and Ram constantly trading blows of increased torque, horsepower, and towing capacity. The latest salvo is the revised, more powerful turbo diesel 6.6-liter Duramax V8 in the 2017 Chevy Silverado. It has 910 pound-feet of torque, an increase of 145, putting it nearly level with the Ford Super Duty. Here's a closer look at where those gains come from. How exactly did Chevrolet add all that torque plus 48 horsepower? The automaker essentially took a fine-tooth comb to the entire engine. Chevy says it changed 90 percent of the V8, and the cumulative effect of those small changes adds up to big increases. As you might guess, the turbocharger is updated. The larger unit features electric actuation of the variable nozzle turbine (VNT), and what Chevy calls a double axle cartridge mechanism that separates the VNT moving parts from the housing. That helps with heat performance as well, with a claim that the exhaust side of the turbo can run continuously up to 1,436 degrees Fahrenheit. Helping that cause are six exhaust gaskets made of Inconel - an nickel alloy that contains chromium and iron – and upgraded stainless steel for the exhaust manifold. Despite having the same cast iron cylinder block, albeit with some minor enhancements, the engine has new cylinder heads, pistons, piston pins, connecting rods, and crankshaft, which have all been upgraded to handle 20 percent higher cylinder pressures. Alongside the increase in pressure, Chevrolet also increased the cylinder head's structure with a honeycomb design. The pattern features high-strength aluminum with dual layer water jackets that not only improve strength, but also optimize water flow for better cooling. For 2017, the cylinder head also benefits from integrated plenum that aids the engine in getting more air under heavy loads. The cylinder head isn't the only component to get a minor update, as the pistons have a larger diameter pin for improved oil flow. The same detailed improvements has been bestowed to the humble connecting rods (second in our hearts only to the inanimate carbon rod). The new design has the bolts oriented roughly 45-degrees to the rod instead of parallel. The angle split design, as it's called allows for easier passage through the cylinder.

GM taps Honeywell's Quality Control System for Ultium battery plant

The Chevrolet Bolt recall has been so frustrating for General Motors that the automaker made an unexpected show of public hopelessness in saying it was "not confident" that LG — which produces the Bolt's batteries — could produce batteries without defects. Even though the remark came before investigation teams founds the source of the Bolt battery issue, it was even more strange considering GM and LG are still in bed together, the two having invested more than $2.3 billion in a 2.8-million-square-foot plant to make GM's Ultium batteries in Lordstown, Ohio. Now that GM has even more motivation to keep its Ultium batteries free of scandal, GM has tapped Honeywell for that company's Quality Control System at the Lordstown facility. The Honeywell QCS will monitor four of the production lines at the facility using "high-precision scanners and basis weight sensors." One of the parameters measured will be electrode coat weight, a key stat in battery performance. Another measurement and control company wrote, "Improving the electrode coating process is a significant part of the equation to delivering better quality and better performing cells – and coating uniformity is seen more and more as a critical requirement." Honeywell says it has more than 20 years of experience with lithium-ion technology, and the firm is already found throughout the green economy. A GM spokesman made sure to say that "the awarding of the Ultium contract to Honeywell has nothing to do with the Bolt recall." Yet in the Honeywell press release, a company director spoke words that could have come straight from GM, with, "Given the opportunity at hand, battery manufacturers such as Ultium Cells must be able to bring new solutions to market with confidence." The new Lordstown facility is scheduled to open in the first quarter of next year. It will employ more than 1,100 workers building the prime movers for coming EVs like the new Hummer and the Cadillaq Lyriq. Ideally, before then, GM will have found and fixed all of the Bolts with issues, and can begin its Ultium era under sunny skies. The automaker started accepting LG batteries again last week, the new batteries should begin reaching dealers around the same time Bolt production resumes on October 11. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Green GMC Safety Technology Electric