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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.

'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).

Truck Trend names GMC Sierra Denali 2016 PTOTY

Citing its best-in-class power, its amenities, and technology, Truck Trend magazine has named the GMC Sierra Denali its 2016 Pickup Truck of the Year. Seven "all-new or significantly revised pickup trucks" were invited to compete, and out of the seven tested categories the Sierra won interior, functionality, and "Empirical," and scored second in highway testing and exterior looks. It beat the Chevrolet Silverado 1500 High Country and Colorado Z71 diesel, GMC Canyon SLT diesel, Nissan Titan XD Pro4X, Ram 1500 Rebel, and Toyota Tacoma TRD Off-Road. In the mag's 43rd annual Four-Wheeler of the Year award, the Range Rover SVR claimed the crown. The Sierra got refreshed this year with new front-end styling with HID headlamps and LED accents, tech features like Apple CarPlay, Android Auto, and wireless phone charging, and optional convenience features like a remote locking tailgate and power articulated assist steps. The big powertrain upgrade was availability of the 5.3- and 6.2-liter V8s with an eight-speed automatic transmission. This is the second time Truck Trend has conferred a PTOTY award, the Ford F-150 walking away with the silverware last year. The nod to the Sierra comes after sister publication Motor Trend named the 2016 Chevy Colorado with the Duramax diesel engine its Truck of the Year. The press release below has the details on how the accolade was won. GMC Sierra 1500 Denali Wins TRUCK TREND'S 2016 Pickup Truck of the Year AwardFirst-Class Amenities, 21st Century Technology, and Best-in-Class Power Lead GMC Sierra 1500 Denali to Best Field of SevenLOS ANGELES December 22, 2015—TRUCK TREND, the nation's premier light-truck authority, has selected the GMC Sierra 1500 Denali as the winner of its second annual Pickup Truck of the Year Award.TRUCK TREND's Pickup Truck of the Year award program is an invitation-only shootout that is only open to all-new or significantly revised pickup trucks for the upcoming model year. For 2016, the field of vehicles included seven entries from five companies and consisted of one variant from each company's eligible product line. This year's contenders included:- Chevrolet Silverado 1500 High Country- Chevrolet Colorado Z71- GMC Canyon SLT- GMC Sierra 1500 Denali- Nissan Titan XD Pro4X- Ram 1500 Rebel- Toyota Tacoma TRD Off-RoadTRUCK TREND's experts were immediately impressed with the Sierra Denali, which is focused on comfort, safety, and innovation.