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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:    

Driving the Chevy Corvette Z06 and Porsche 911 Carrera T | Autoblog Podcast #551

On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Green Editor John Snyder and Associate Editor Joel Stocksdale. We talk about the wide variety of the cars we've been driving, starting with the Chevrolet Corvette Z06 and Porsche 911 Carrera T. Then we discuss the more powerful 2019 Mazda MX-5 Miata, our long-term Honda Ridgeline and our week with the Hyundai Ioniq PHEV. Finally with Pebble Beach on our minds, we preview the Concours d'Elegance.Autoblog Podcast #551 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 2019 Chevrolet Corvette Z06 2018 Porsche 911 Carrera T 2019 Mazda Miata 2018 Honda Ridgeline 2018 Hyundai Ionic Plug-In Hybrid Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video:

GM's Reuss predicts 2016 Chevy Camaro will outperform Ford Mustang in every way

We aren't going to be seeing the next-generation Chevrolet Camaro until next month. But even though we know when we're going to see the new muscle car, it's totally unclear whether Chevy will dole out technical details. That means we can't answer the latest version of the age-old question: Camaro or Ford Mustang? Not surprisingly, General Motors North America President Mark Reuss has already stated his position, saying he was "very confident" that the sixth-generation Camaro will be faster, more agile and more efficient than the Ford. Reuss made his comments after saying he drove the new Camaro back-to-back with the Mustang the week prior. Reuss' statement came in a conversation with Fox News about the 2016 Camaro where he elaborated on the car's weight shedding and how it fit into GM's strategy on other new models. "There are some really cool things in the Camaro, that are quite different than the Malibu, [and] CT6," Reuss told Fox. As we reported previously, the Camaro will shed some 200 pounds by switching to aluminum and other lightweight composites for some of its components. With May 16 just over a month away, here's hoping Reuss decides to loose some other details on the next Camaro ahead of its debut. Related Video: