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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:    

Driven: 2020 BMW X7 M50i, M760i and M340i | Autoblog Podcast #623

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by West Coast Editor James Riswick and Road Test Editor Zac Palmer. They discuss news about the Cadillac V Blackwing, as well as some interesting auction listings that we spied. They also talk about cars from the fleet including the BMW M760i, X7 M50i and M340i. Autoblog Podcast #623 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving 2020 BMW M760i xDrive 2020 BMW X7 M50i 2020 BMW M340i Impala auction listing Cadillac V Blackwing news Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: Nissan Frontier and a mid-engine Mustang | Autoblog Podcast #622

Cadillac clears camo off the XT3 revealing grille, lighting details

Up until now, every Cadillac XT3 we've seen has been buried under covers and vinyl wraps, but one of our spy photographers recently captured a group of them with significantly less camouflage. As a result, we finally get a relatively clear picture of what the car will look like. The nose blends the look of current Cadillacs with cues from last year's Escala concept. The headlights still appear to stretch up into the top of the fenders like its production brethren, but they don't descend as far down the front fascia, a hint of Escala influence. The grille also features more of egg-crate mesh like that Cadillac concept. In profile, we can see evidence of the XT3's smaller size compared with the XT5, mainly in the lack of any glass area behind the rear door. Other evidence of the smaller size is that our spy photographer reports the cars were being tested alongside the BMW X3 and Mercedes-Benz GLC-Class. The profile also shows that the XT3 will have a hard-edged rear end with a rakish hatch. At the back, there isn't a whole lot to report, but the taillights look like they'll be interesting. There appears to be a horizontal element in the middle of the hatch similar to what we've seen on the Escala and the refreshed XTS. We can also see some lights up on the C-pillar, which indicates that the XT3 will also have tall vertical elements up those pillars like on the Escalade. We expect the XT3 to show up late in 2018. It will likely be powered by a turbocharged four-cylinder of some sort, and because it will probably be based on an existing GM crossover or sedan platform, it will probably have front-wheel drive and/or a front-drive based all-wheel-drive system. Related Video: Featured Gallery Cadillac XT4 Spy Shots View 13 Photos Image Credit: Brian Williams Spy Photos Cadillac Crossover SUV Luxury cadillac xt3