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2020 GMC Sierra HD caught in double-cab, low-trim gas-engine guise

Naturally when the 2020 GMC Sierra HD was revealed, GMC picked the flashiest, most-impressive Denali model with the big crew cab configuration and diesel engine. But obviously not all will be equipped that way, so it's exciting to see a lower trim model like the truck above. This 2020 GMC Sierra HD is a more modest SLT trim model equipped with the gas V8 and lacking the MultiPro tailgate. Styling doesn't take a hit with the shorter shape, and arguably, it looks more athletic without so much metal between the wheels. The length is the only real difference, with the rest of the sheetmetal just as chisled on the bigger version. Interestingly, this gas-powered Sierra HD still has a big hood scoop from its diesel sibling. On the current GM heavy duty trucks, only the diesel models get a scoop, and it's specifically for getting more cool air to the intake. The Silverado HD may continue this differentiation, but GMC is clearly keeping it for all models. When the Sierra HD goes on sale this summer, it will be available with either a 6.2-liter gasoline V8 like in this truck, or a 6.6-liter turbodiesel V8 making 445 horsepower and 910 pound-feet of torque, the same as the current model. All models get bedside steps, and the MultiPro tailgate is available either as standard or an option with all trims. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

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.

GMC Sierra EV AT4, Chevy Silverado EV Trail Boss caught in spy photos

We've known for a while now that GMC and Chevy have been working on AT4 and Trail Boss versions of their respective Sierra EV and Silverado EV pickup trucks. But we're getting our best look yet at them with these spy photos. They give us a better idea of what body changes there will be, as well as a close-up of the tires, giving us their size and type. Some basics of off-road trim levels are obvious to spot. Both trucks feature bright red recovery hooks up front. But beyond that, there isn't much different from the outside of either truck compared to the base examples of each. The front bumpers are basically the same profile as the base bumpers, with the exception of the recovery hooks. The Silverado has natural black plastic fender flares, whereas the GMC has body color examples with integrated marker lights. They both get the same standard side steps, and the rear bumpers also appear unchanged. Each of these is equipped with the MultiPro/Multi-Flex tailgate. Chevrolet Silverado EV Trail Boss prototype View 14 Photos Really the biggest change appears to be in the wheels and tires. Each of them have unique designs, but they have the same dimensions. They're 18-inch wheels with 285/75R18 tires. That comes out to just shy of 35 inches in diameter, a good size of tire for an off-roader — and note how it doesn't even look all that large on such big trucks. Said tires are Goodyear Wrangler Territory AT all-terrains. The gas-powered trucks come with slightly narrower (275) mud-terrain versions as standard. Both of these trucks should start somewhere below the range-topping first edition models the two brands are currently marketing to the public, which hover between $95,000 and $110,000 depending on specification. The Silverado WT does start at just under $80,000, and we would expect the Trail Boss and the Sierra EV AT4 to come in somewhere above that, possibly between $85,000 and $90,000. Specifications are a mystery. It seems likely that at least the Silverado will get the WT's dual motors with 510 horsepower and 615 pound-feet of torque. The GMC could potentially get the more powerful motors making 754 horsepower and 785 pound-feet of torque as a way to differentiate itself, though this is speculation. The 204-kWh battery pack is probable, though there are rumors that at least GMC is going to start offering a smaller, more affordable 170-kWh pack that could be an option.