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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.

2022 GMC Sierra Preview | GM's 'premium truck' is actually now premium

Pros: Quiet and torque-rich Duramax diesel; big touchscreen on most trims; great trailering tech; versatile MultiPro tailgate Cons: Worse ride than most rivals; AT4X priced like a Raptor but doesn't go like a Raptor The 2022 GMC Sierra 1500 is GM’s upmarket half-ton pickup, with a supposed emphasis placed on interior quality and materials rather than bare-bones durability. Supposedly, at least. In reality, the most recent generation hardly lived up to that promise as it showed few upgrades over its Chevy Silverado sibling, which itself possessed a ho-hum, not-really-trying interior clearly overshadowed by Ram and Ford that at least match it in most other respects. It was particularly noticeable when comparing top trim levels. GMC's supposedly premium entry, and especially the Denali, just didn't cut it. That changes in a huge way for 2022. First, thereÂ’s not just one new and massively improved interior, there are two. The SLE, Elevation and SLT once again share their interior design with the Silverado, but that includes a more visually appealing design, better materials, smarter storage and a significant technology upgrade thanks to the standard 13.4-inch touchscreen running the user-friendly Android Automotive OS. The AT4 and Denali trim levels, including the new AT4X and Denali Ultimate, step things up even further with a different dash design and upgraded interior materials. The Ultimate definitely lives up to its name with a characterful and, yes, premium vibe that stands tall against the best of Ford and Ram. Other welcome updates include the option of Super Cruise on top trim levels and a massively more powerful base turbo four-cylinder engine (it produces more torque than the 5.3-liter V8!). Effectively, the 2022 GMC Sierra is now the truck it shouldÂ’ve been since the beginning of this current generation and definitely worth a look – especially if youÂ’re in the market for a premium truck. Now, a bit of housekeeping. While the massively updated model shown here is officially the 2022 GMC Sierra, thereÂ’s a chance you could come across something called the "2022 Sierra Limited.” That was just last year's truck with the 2022 model year stapled to it. There are many reasons for this, but suffice it to say, if you see a Â’22 Sierra Denali with the ugly robot-face dashboard (below right), youÂ’re looking at a Limited. Also, the availability of Super Cruise and other features have been hampered by supply shortages.

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.