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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:    

2021 Cadillac CT5-V Blackwing spied up close, showing off bronze wheels

Here is yet another closer look at the upcoming Cadillac CT5-V Blackwing sedan. Some pertinent details have been flying around this one for a while now. A photo of the interior showing a manual transmission is the latest leak, and it’s also one of the most exciting. Reports have also shone light on the engine: ItÂ’s supposed to be getting an updated version of GMÂ’s 6.2-liter supercharged V8. There will be no shortage of horsepower and torque. These latest spy shots reveal a couple of other new developments. For one, we get a really great look at the wheel and tire package on the car. Those dark bronze wheels are new, and they sure do look like production-style wheels to us. If anything, they remind us of the Brass Monkey wheel color found on Challengers and Chargers. Wide Michelin Pilot Sport 4S tires wrap those wheels. It gets 305-section-width tires in back and 275-section-width rubber in front. The wide, staggered setup is no surprise considering that this car will very likely put out more than 640 horsepower. ThereÂ’s a great deal of camouflage missing from the car as a whole, too. The hood is out in the open, and the same goes for the upper portions of the doors. ThatÂ’s because those parts of the car are virtually identical to the regular CT5-V. Sorry, no massive hood scoop on this sedan. The front grilleÂ’s lower opening does look significantly taller on this car, though. And where the standard CT5 has covered up fake vents, this car appears to have real, open venting. All the lighting is the same, but the maw of the CT5-V Blackwing is definitely much more aggressive than the standard CT5-V. Cadillac hasnÂ’t provided us with a date on when the new CT5-V Blackwing will be revealed, but has assured us that itÂ’s coming soon. We expect its little sibling, the CT4-V Blackwing, will debut right alongside this one. Related video:

Canada opens probe into 250,000 GM pickups, SUVs over brake performance

Transport Canada, the auto safety regulator, has opened a probe into braking issues in nearly 250,000 General Motors full-size pickups and SUVs after U.S. officials launched a similar probe last year, the agency said on its website. The U.S. National Highway Traffic Safety Administration (NHTSA) in November into 2.73 million U.S. 2014-2016 model year SUVs and pickups after receiving 487 reports of hard brake pedal effort accompanied by extended stopping distance that were attributed to deterioration of the engine-driven brake assist vacuum pump. Transport Canada's probe covers 249,700 2015 through 2017 model year vehicles including the Cadillac Escalade, Chevrolet Suburban, Chevrolet Tahoe and GMC Yukon as well as 2014-2017 Chevrolet Silverado LD and GMC Sierra LD vehicles. The U.S. agency said it had reports of nine incidents of vehicles incurring damage as a result of colliding with another vehicle or fixed object at low speeds and reports of two injuries. NHTSA said if the pump fails to operate, the amount of brake power assist can be significantly reduced, extending vehicle stopping distance. The NHTSA sent GM an information request in a Feb. 7 letter. A GM spokesman said he had no update on the investigation. Reporting by David Shepardson; editing by Jonathan Oatis