2010 Gmc Yukon Denali on 2040-cars

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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.

2024 GMC Sierra prices go up — and also down

The 2024 GMC Sierra 1500 is ready to work the yard, but how much you'll need to get the pickup back to your yard has changed compared to the 2023 Sierra — most often in a good way. The changes for the new model year aren't substantive, just enough to give Sierra lovers enough modification to prove they have the latest. The AT4X was only available with the 6.2-liter V8 in 2023; for 2024 the big bad off-road trim makes the 3.0-liter Duramax diesel inline-six the standard engine and takes $2,400 off the base price compared to last year's 6.2-liter. On top of that, the 6.2-liter AT4X costs $500 less than last year. Re: the gas V8, this is the opposite of the hefty increases we've seen Chevrolet generally do with 6.2-powered trims. The SLT, AT4, AT4X, Denali, and Denali Ultimate get the option of an active exhaust on four-wheel-drive trims with the 6.2-liter for $395. The 2.7-liter Turbo H.O. four-cylinder gas engine is rebranded TurboMax and comes with a five-year, 100,000-mile warranty. Two new wheel designs enter the catalog, availability depending on trim, and colors join the palette, their availability also trim-dependent: Downpour Metallic replacing Pacific Blue Metallic, and Thunderstorm Grey, both adding $495 to the price. Now to the haggling. Even though destination has risen $100, to $1,995, five of the eight trims — including the diesel AT4X — are less expensive than they were a year ago, some of them by $1,000. The new sums after destination and their differences from 2023 are:  Sierra Pro Regular Cab Standard Box 2WD TurboMax: $39,695 ($700) SLE Double Cab Std Box 2WD TurboMax $51,095 ($1,000 less) Elevation Double Cab 2WD TurboMax $52,795 ($1,000 less) SLT Crew Cab Short Box 2WD 5.3L V8 $56,795 ($1,000 less) AT4 Crew Cab Short Box 4WD Duramax 3.0L I6 $68,595 ($500 less) AT4X Crew Cab Short Box 4WD Duramax 3.0L I6 $81,195 (New trim) Denali Crew Cab Short Box 2WD 5.3L V8 L84 $68,595 ($1,000) Denali Ultimate Crew Cab Short Box 4WD Duramax 3.0L I6 $83,490 ($500) Since certain varieties of the 2023 Sierras are still on the configurator and in dealer inventory, any business wanting to take a tax loss for 2023 should buy the older Sierra. Regular buyers willing to forego the new bits on the 2024 Sierra will likely be able to find dealers ready to take a machete to the MSRPs of some 2023 Sierras sitting on the lot.

2015 Sierra All Terrain HD looks ready to hit heavy-duty trails

GMC is getting its heavy-duty trucks ready for the mud this summer with its All Terrain package for the Sierra 2500HD and 3500HD. Meant to blend style, tech and ruggedness, the pack includes a lot of extra chrome outside and an off-road package underneath.
The 2015 Sierra All Terrain HD trucks naturally come standard with four-wheel drive with an electronically controlled transfer case to handle things in the dirt. The Z71 off-road package is also standard, which includes Rancho twin-tube shocks, hill descent control and a skid plate. To add some style when off the beaten path, the pack includes chrome trim on the mirror caps, lower bumper and grille surround, plus LEDs around the headlights and 18-inch wheels (20-inchers are optional on the 2500HD). The 3500HD also gets chrome, adjustable outside camper mirrors. The interior receives a technology upgrade thanks to the standard rearview camera and IntelliLink infotainment that can act as a Wi-Fi hotspot through OnStar 4G LTE, read text messages and includes Siri Eyes Free for iPhone users.
The All Terrain package goes on sale on both trucks this summer and is offered on either the SLE or SLT trim levels in double cab and crew cab models. The standard engine is the 6.0-liter V8 with 360 horsepower and 380 pound-feet of torque, but the Duramax 6.6-liter, diesel V8 with 397 hp and 765 lb-ft is also available. The gas engine is mated to a Hydra-matic six-speed automatic, and the diesel uses an Allison six-speed automatic. Scroll down to read the full announcement about these heavy-duty off-roaders.