2015 Gmc Sierra 2500 Sle on 2040-cars

Auto blog

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!"

2020 Chevy Silverado, GMC Sierra recalled due to faulty brake component

General Motors is recalling 2020 Chevrolet Silverado 1500 and GMC Sierra 1500 pickups to fix a defect in the trucks' brake system. Certain Silverado and Sierra pickups were produced with brake-caliper bolts that were not heat-treated. Without heat-treating, the bolts are weaker than they should be, and there is a risk that they could fail, which would affect the trucks' braking performance, possibly leading to a crash. In total, 20,352 vehicles are affected. Owners of affected trucks will be contacted by GM. Dealers will inspect the bolts and replace those that are defective. Related Video:      

GMC unveiling 2021 Yukon, Yukon XL on January 14

UPDATE: We received a reply back from a representative at GMC confirming that the new Yukon will be revealed on January 14. The text has been updated to reflect this. General Motors is renewing its body-on-frame SUVs, and GMC's Yukon is next in line to receive a full makeover. It's scheduled to break cover on January 14 alongside the long-wheelbase Yukon XL. It's reasonable to assume we would have gotten our first glimpse at the next Yukon during the 2020 Detroit Auto Show had the event not moved to June. The new date is too close to the model's on-sale date, so GMC will unveil it during a standalone event held in Vail, Colorado, according to GM Authority. We reached out to GMC, and a representative confirmed that is indeed the reveal date for the full-size SUV. Spy shots suggest stylists took GMC's two biggest SUVs in a sharper, bolder direction. Both models share the same front end, which borrows styling cues like C-shaped headlights from the Sierra pickup. Brand-specific rear lights help the Yukon models stand out from their Chevrolet-badged siblings, the Tahoe and the Suburban, which hasn't always been the case. The standard Yukon and the Yukon XL will each grow in size, though there's no indication GMC's naming structure will change to reflect that; Yukon XXL admittedly doesn't have much of a ring to it. While we haven't seen the interior yet, we expect it's getting a generous serving of technology, including a new, touchscreen-based infotainment system. The larger exterior dimensions will clear up more space for people and gear, so average-sized adults will be able to fit in the third-row seats. The range-topping Denali variants of both models will return to satisfy those who crave sumptuousness. The sheet metal will hide much of the same hardware found under the Tahoe/Suburban duo, including an independent rear suspension added in the name of comfort and handling. Powertrain specifications should carry over, too, meaning the entry-level engine will be a 5.3-liter V8 rated at 355 horsepower and 383 pound-feet of torque. The list of options will include a 6.2-liter V8 with 420 horsepower on tap, and we're betting the straight-six turbodiesel available on the Bowtie-badged SUVs will also be offered at an extra cost. Rear-wheel drive and a 10-speed automatic transmission will come standard, and buyers will be able to pay extra for four-wheel drive. The next GMC Yukon and Yukon XL will go on sale halfway through 2020 as 2021 models.