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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:    

Submit your questions for Autoblog Podcast #313 LIVE!

We record Autoblog Podcast #313 tonight, and you can drop us your questions and comments regarding the rest of the week's news via our Q&A module below. Subscribe to the Autoblog Podcast in iTunes if you haven't already done so, and if you want to take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
Discussion Topics for Autoblog Podcast Episode #313
2014 Chevrolet Silverado and GMC Sierra introduced

Shanghai debuts, Jeep's new Rubicon anniversary rigs | Autoblog Podcast # 777

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Byron Hurd for a recap of the past week's worldwide debuts along with some updates from their recent adventures. They start off discussing the rumors of a new Ford Mustang Raptor and what that means in the context of previous rumors of a Corvette SUV. Then it's time to talk Shanghai, where Polestar, Buick, Volkswagen, Porsche and Lincoln all had big reveals. After that, they segue to Byron's trip to Moab for the 2023 Easter Jeep Safari preview where he drove the AEV Level II Jeep Wrangler Rubicon 20th Anniversary Edition. From there, they reminisce about Mustangs in a nod to the nameplate's 59th anniversary, after which they stick to the theme with a sub-$15,000 RWD used-car discussion. Is there anything worth buying in this price bracket in today's economy? Autoblog Podcast # 777 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown ShanghaiPolestar 4 is a Polestar without a rear window 2024 Lincoln Nautilus debuts with big redesign, new hybrid option Volkswagen ID.7 fully revealed as VW's sleek and spacious flagship electric sedan 2024 Porsche Cayenne gets more power, screens, equipment 2024 Buick Envista revealed as a good-looking, quite-affordable crossover 'coupe' News Ford Mustang Raptor off-road coupe rumored for 2026 2025 Chevy Corvette SUV said to start with ICE power, not be EV-only What we're driving 2023 Jeep Wrangler Rubicon 20th Anniversary Edition: On the trail to six figures 2023 Easter Jeep Safari: The search for the missing pink Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related video: Podcasts Rumormill Auto Shanghai Buick Chevrolet Jeep Porsche Volkswagen Crossover SUV Concept Cars Electric Future Vehicles Luxury Off-Road Vehicles Performance Sedan Polestar