1997 Gmc Sierra 1500 Sl 77k Orginal Documented Miles Orginal Survior Farm Truck! on 2040-cars

Auto blog

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 recalls full-size truck, SUVs and vans over faulty shifter mechanism

Twelve different General Motors vehicles from the 2013 model year, up to 54,686 units in total, are being recalled over two potential issues with their steering columns. The models in question, all full-size trucks, SUVs or vans, are the: Cadillac Escalade, Escalade ESV, Escalade EXT, Chevrolet Avalanche, Express, Silverado, Suburban, Tahoe, and GMC Savana, Sierra, Yukon and Yukon XL.
The affected vehicles were built with a fractured parking lock cable or "a malformed steering column lock actuator gear in the lock module assembly." As a consequence, they could shift out of park without the brake pedal being applied or with the key removed or in the off position.
A bulletin from the National Highway Traffic Safety Administration indicates that the recall should begin on January 17. GM will notify owners, at which time they can take their vehicles to their dealers for repair free of charge. Have a look at the bulletin below for more information.

GMC Canyon next generation previewed with off-road AT4X trim

GMC is preparing to give the Canyon, its smallest and most affordable pickup, a complete makeover. While we won't see the truck for a few months, the company released a preview image to give us an idea of what to expect and confirmed the lineup will include an AT4X model. Although the teaser keeps most of the sheetmetal hidden, the truck appears to receive a more chiseled hood and concave door skins that should make it look less slab-sided. The fenders are eye-catching as well: They're more punched-out that the current-generation model's. Keep in mind that we're looking at the AT4X trim, which will be positioned as the off-road champion of the range and should consequently get a brawnier-looking design. Other off-road goodies include big Goodyear Wrangler tires wrapped around 17-inch beadlock-capable wheels, plastic wheel arch flares, and rock rails. GMC is keeping additional details under wraps, but we're guessing suspension tweaks are part of the package as well. After all, the current-generation AT4 benefits from a one-inch suspension lift and skid plates, among other upgrades. This isn't the first time we've seen or heard of the Canyon AT4X. Our spy photographers caught a camouflaged prototype that looks taller and considerably more rugged than the AT4 in July 2021, and the Canyon AT4 OVRLANDX concept introduced in August 2021 seemingly previewed some of the features that will trickle down to the production model, including the rock rails and wheel arches. GMC will unveil the next-generation Canyon this summer, and we expect to hear more about it in the coming weeks. And, if a new Canyon is around the corner, that likely means that the next Chevrolet Colorado isn't far behind. Both will compete directly against the new Ford Ranger, which has only been unveiled for overseas markets as of writing and which will spawn a range-topping, V6-powered Raptor. Another competitor the duo will need to fend off is the Nissan Frontier, which got its first update since the 2005 model year for 2022. Already offered on the 2022 Sierra, the outdoorsy AT4X trim will spread across the GMC range in the coming years. Nothing is official yet, but earlier spy shots strongly suggest that the Sierra Heavy Duty will be treated to the AT4X treatment in the not-too-distant future. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.