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Why an independent rear suspension for GM's new, full-sized SUVs wasn't easy

A Motor Trend report last month laid out how Cadillac's 4.2-lier twin-turbo Blackwing V8 could be an orphan due to cost concerns in the GM empire. Last-minute chassis changes to Cadillac's new sedans and XT6 crossover led to engine bays that couldn't fit the Blackwing. On the SUV side, according to the report, the new independent rear suspension for big people haulers cost so much to implement that GM ruled out reworking the Escalade to accept the Blackwing. At least one commenter rightly asked how could a suspension swallow that much money. A new piece in Motor Trend has the answer. The excellent Alissa Priddle spoke to Tim Herrick, GM's executive chief engineer for full-size trucks, about why the clean-sheet IRS cost "multimillions of dollars."  First, GM would need to build a new body shop at the Arlington, Texas plant that assembles the automaker's big SUVs to stamp the numerous wholly new parts and panels accommodating an IRS. Then GM would need to design and pay for a new assembly process. On top of those up-front costs, there was the incremental cost of the four-link IRS components being more expensive than those in the trucks' former leaf-sprung solid axles. Herrick endured so many rejections for so long that he remembers the date and time when he got approval for the new unit. He said it came down to a meeting where he told a higher-up, "I'll make you a deal: If we get to the reveal, or if we launch this and you think this was a dumb idea, I'll hand you my badge and let you walk me out." Head to Motor Trend to read the full story. Based on Herrick being on stage to help present the new SUVs to the press, and on our First Ride in the new Chevrolet Tahoe and Suburban at GM's Milford Proving Grounds, it appears this will have a happy ending for all involved. Furthermore, since Herrick worked on the T1 platform that supports the big SUVs as well as the light- and heavy-duty pickups, he understood the demands on the commercial side, too. That could be why when Roadshow asked Tim Asoklis, chief engineer of the Tahoe and Suburban, if the new IRS could endure life in the Chevrolet Silverado and GMC Sierra, Asoklis answered, "Oh, absolutely." Related Video:    

GM Recalling 370,000 Trucks For Fire Risk

DETROIT (AP) - General Motors is recalling 370,000 Chevrolet Silverado and GMC Sierra pickups from the 2014 model year to fix software that could cause the exhaust components to overheat and start a fire. The recall includes 303,000 trucks in the U.S. and 67,000 in Canada and Mexico. All of the trucks involved have 4.3-liter or 5.3-liter engines. GM said eight fires have been reported, but no injuries. One garage was damaged, the company said. All of the incidents occurred in cold weather. The company is asking customers not to leave their trucks idling unattended. GM dealers will reprogram the software for free. The company will inform owners starting Jan. 16. The major recall announcement, which came on Saturday, marred the Silverado's winning of the 2014 North American Truck of the Year Award at the Detroit Auto Show on Monday. Related Gallery Our Favorite Cars For Winter View 11 Photos Recalls Chevrolet sierra

Take a close look at the guts of the Chevy Volt battery, powertrain

Just how intimate would you like to get with the powertrain in a Chevy Volt? If you're anything like YouTube user d55guy, then spending a half hour filming yourself taking apart the battery pack, motor, inverter and more for a look inside sounds like your idea of fun. After all, this way you get to see the cooling system, the heavy safety kill switch and count up the individual cells in the battery modules. Fun! Turns out, we also enjoy languidly paced Volt dissection video goodness, and we think you might want to see it as well. So, we've embedded two videos below and if you don't have a better understanding of how the Volt is put together after watching them, well, at least you can't say we never tried to show you anything. Given that what's really happening here is the organized 'destruction' of an expensive and potentially dangerous object, let's talk safety. There's a serious disclaimer at the beginning of the videos and on the YouTube description page, but we feel the need to repeat the gist of it here: do not try this at home. The creator of the video says he is a trained engineer and has been doing things like this "for the better part of a decade," so he apparently knows what he's doing. With that in mind, watch it all below. When you're done seeing the insides of a Volt powertrain up close, if you need more filmed EV dissection/destruction, check out this video designed for first responders approaching a damaged Tesla Model S. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.