2010 Gmc Acadia Sl Sport Utility 4-door 3.6l on 2040-cars

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Diesel Power finds the ultimate modified oil-burner

For nine years, Diesel Power magazine has run the Diesel Power Challenge, this year's grindfest being "a week-long torture test that features seven events, nine trucks, 8,000 horsepower, and nearly 15,000 pound-feet of torque." The road to being crowned "the most powerful truck" starts with a dyno run, and then continues through the completion of a CDL-style obstacle course, an eighth-of-a-mile drag race while towing a 10,000-pound trailer, a quarter-mile drag race without a trailer, a fuel economy test in the mountains and finally a sled-pulling test through a 300-foot-long packed-mud pit.
What kind of trucks get into such a fight? Last year's winner, for instance - who upgraded his truck this year to prove he didn't "luck into the win" - drives a 2008 Ford F-250 Super Duty with a 6.4-liter Power Stroke V8 upgraded with a custom intake, Elite Diesel triple turbos and a two-stage nitrous system. Another competitor has a 2005 Dodge Ram 2500 powered by a 5.9-liter Cummins inline-six, upgraded with Garrett turbos, dual-stage nitrous, a seven-inch exhaust stack and twin fans built into the bed to cool the Sun Coast Omega transmission. The numbers on that truck: 1,255 horsepower, and 2,063 pound-feet of torque at the wheels. Naturally, as the image above might suggest, things don't always end well.
You'll find all five videos covering this years challenge below. A scene in the dyno video sums it all up perfectly: a competitor leaves his nitrous on too long and the crew is treated to some ominous poppings, he leans out the window, throws both hands up and shouts, "Amer'ca!"

2021 GMC Yukon Denali adds another extra-luxe accessories bundle

For the 2018 GMC Yukon Denali, GMC added a Denali Ultimate Package that combined every option already available with some 22-inch Midnight Silver rims. In 2020, GMC expanded build options for the Terrain with a Denali Premium Package, lumping together a couple of a la carte packages as an exclusive mix of features. The 2020 Yukon Denali configurator includes a lightweight Denali Premium Package, too, but for 2021 GM Authority reports the top-tier choices will expand to include an entry-level Denali Deluxe Package along with the Denali Premium and Ultimate options. The Deluxe Package checks the boxes for the Advanced Technology Package, Advanced Security Package, and the Rear Seat Media System. The long list of tech roped in with that trio includes adaptive cruise control, enhanced automatic emergency braking, rear camera mirror and washer, interior movement sensors, glass break sensors, dual 12.6-inch rear seat-mounted screens, two HDMI ports, and wireless projection capability. The exterior showpiece is a quartet of 22-inch bright machined aluminum wheels with premium paint, affixed with wheel locks. Go with those rims and the Denali Deluxe Package costs $5,750, opting for a different set of wheels can drop the price to $3,775. On top of that, choosing the right combination of options to go with the Deluxe Package can lower the price another $500. The Denali Premium Package includes almost everything above, only omitting the Rear Seat Media Package. In place of the screens for back-seaters, the bundle installs a powered panoramic sunroof and power-retractable assist steps with perimeter lighting. Purchased with the 22-inch wheels, this assortment runs $7,000, or $5,025 with a different set of wheels. Here again, the right combination of additional packages can save $500. The Denali Ultimate Package combines everything in the bundles above, plus the Max Trailering Package that gets GMC's ProGrade Trailering System and high-capacity engine cooling. The price is $10,460 on a rear-wheel drive Yukon Denali, $11,255 on the four-wheel drive models. Choosing a different wheel only saves $1,000 in this case, and there's no extra discount available. The 2021 Yukon is expected to enter production next month at GM's Arlington Plant in Texas, Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.    

GM confirms 2015 Silverado, Sierra to get 8-speed automatic

When viewed alongside the next Ford F-150 and the Ram 1500, there is one thing that seems to be missing from the Chevrolet Silverado and GMC Sierra. Where the F-150 will rely on turbocharging and aluminum architecture and the Ram sports an eight-speed automatic and an air suspension, the General Motors twins lack a big, calling-card feature. They're very good, very refined trucks, but one could argue that they're not terribly innovative.
And while it might not be as flashy a feature as air suspension or a lightweight skin, the Silverado and Sierra will get their own eight-speed automatic for 2015, a transmission that will be paired with the company's Ecotec3 6.2-liter V8. The new cogswapper will also find its way into the GMC Yukon Denali, but for now, there's no indication why the Cadillac Escalade, Suburban, Tahoe and standard Yukon are being left out.
According to GM, the new gearbox is about the same size and weight as the current Hydra-Matic 6L80 six-speed. By the time the new powertrain combination enters production late this year, the EPA will almost certainly have gotten around to certifying the vehicles' fuel efficiency. Until then, feel free to speculate. The current Silverado with the 6.2 and six-speed auto returns 14 miles per gallon in the city and 20 on the highway. How much do you think the eight-speed will improve those figures? Scroll down for the official press blast from General Motors, and then head into Comments.