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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 extends production at Detroit factory until early 2020

General Motors Co said on Friday it had extended the production at its Detroit Hamtramck plant until January 2020, against an earlier plan to discontinue production in June this year. The No.1 U.S. automaker is revamping its operations, which include plant closures and thousands of job cuts, as it looks to boost profitability in the wake of declining U.S. auto sales. The Hamtramck plant will continue to produce the Chevrolet Impala and Cadillac CT6 sedans until early next year, the company said. "We are balancing production timing while continuing the availability of Cadillac advanced technology features currently included in the CT6-V — the Blackwing Twin-Turbo V-8 (engine) and Super Cruise (driver assistance system)," GM said. The plant has already discontinued production of the Buick LaCrosse sedan and Chevrolet Volt electric hybrid car. Detroit-based union United Auto Workers' President Gary Jones said GM's decision to continue production at the plant was a relief for the workers as well as their families. "We commend GM for today's decision and we reiterate the importance of a collective bargaining process in times like these," Jones said. Reporting by Ankit Ajmera. Related Video:

Cadillac XT5 platform to underpin three-row crossover

Cadillac just launched the XT5 crossover to replace the SRX. But that's only the start. Speaking with Automotive News, Caddy president Johan de Nysschen confirmed that a new three-row crossover is also on the way. The seven-seater is based on a stretched version of the flexible platform underpinning the XT5, which we just drove recently. Taking that approach will give the luxury brand a larger crossover to pit against the likes of the Infiniti QX60, Audi Q7, and Volvo XC90 without having to develop one from scratch. It will also give buyers a more car-like alternative to the larger, truck-based Escalade. "It's one of the benefits of having this very flexible architecture. We can expand it, make it longer and wider. That gives us the ability to develop the car very quickly, as opposed to starting from scratch," de Nysschen told AN. "It's not running yet. It is a program request that we initiated with the engineers only last year. They are working at remarkable, record-breaking speed to get us the car." The new model would likely be called the XT7 and offer similar levels of equipment to the existing, smaller XT5. The existing mid-size model packs a 3.6-liter V6 mated to an eight-speed automatic transmission and comes in four trim levels. Related Video: