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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:    

2015 Chevrolet Corvette Z06

"Corvette" has stood for American muscle, American sports car, and American supercar. In many cases, it still stands for America: liberty on the go, LS-powered freedom. There was also a time when it meant really impressive numbers that didn't equate to really impressive handling, and a not-so-nice cabin. The handling issue really turned the road-legal corner when the C5 Z06 was introduced in 2001, and by the time the super-duper ZR1 ended its run in 2010, Corvette had exorcised practically all of its dynamic demons. But when I took a seat in the 2015 Corvette Z06 on the first day of my week-long loan, I espied a few demons still squatting in the interior. When colleague Seyth Miersma drove the Z06, he wrote, "Listen, I'm not going to be the guy that dogs the Corvette for having a cheap-feeling interior, this generation has put those once-legitimate claims to rest." Well, I am going to be that guy, because I don't think those claims have been put to rest. One day Chevy will give us leather that looks and feels like leather, instead of the astonishingly thin hide that is laid directly on top of the instrument panel structure. This material was set off by white stitching, but there were no seams, just a trail of white stitches. In some places it was hard to tell where the leather ended and the plastic began; or it might all have been the same upholstery, I don't know. Five dollars of foam padding would add five thousand dollars of luxury to the cockpit. One day Corvette will have plastics that don't look so plasticky. I know General Motors can do it. And after years of thinking Corvette seats were too wide and flat, this latest Z06 is almost there. The seatbacks were nice, but the exaggerated side bolstering on the seat bottoms was too narrow and sharp. That's a personal preference, though; other drivers with thinner thighs will think differently. My complaint isn't that the interior isn't luxurious, it's that it's not luxurious enough. If Chevrolet was worried about pricing, it could add some kind of profligate package to the options list. Have some ex-Porsche people design it, call it the Teutonic Splendor Package, slap a massive price on it, and count the money. People will buy it, and no one will ever have to say again, "But the interior..." That said, this test car's cabin had every feature I wanted. The gauge cluster was bright, crisp, and readable in every shade of daylight.

GM recalls 638,000 U.S. SUVs, trucks for unintended braking

WASHINGTON — General Motors is recalling 638,000 U.S. sport utility vehicles and pickup trucks because a wheel-speed sensor could fail and cause unintended braking, it said Thursday. The recall covers 2015-2020 Chevrolet Suburban, Tahoe, and Yukon and 2014-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles equipped with a 5.3-liter engine, a 3.08-ratio rear axle and four-wheel drive. The sensor failure could result in unintended activation of the driveline protection system, and cause unintended braking of the wheel on the opposite side of the failed sensor. That could cause the vehicle to pull to one side unexpectedly, increasing the risk of a crash, the Detroit automaker said. GM said it was not aware of any crashes relating to the issue but found 150 field claims alleging the condition caused unintended braking or lateral vehicle motion. A GM dealer in May submitted a warranty report relating to the issue in a 2018 GMC Yukon, and two days later, a GM brand quality manager submitted the report to GMÂ’s Speak Up For Safety program that tracks potential safety issues, which prompted a GM investigation and testing. Recalls Chevrolet GM GMC Truck SUV