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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’s move to Woodward is the right one — for the company and for Detroit

Back in 2018, Chevy invited me to attend the Detroit Auto Show on the company dime to get an early preview of the then-newly redesigned Silverado. The trip involved a stay at the Renaissance Center — just a quick People Mover ride from the show. IÂ’d been visiting Detroit in January for nearly a decade, and not once had I set foot inside General MotorsÂ’ glass-sided headquarters. I was intrigued, to say the least. Thinking back on my time in the buildings that GM will leave behind when it departs for the new Hudson's site on Woodward Avenue, two things struck me. For one, its hotel rooms are cold in January. Sure, itÂ’s glass towers designed in the 1960s and '70s; I calibrated my expectations accordingly. But when I could only barely see out of the place for all the ice forming on the inside of the glass, it drove home just how flawed this iconic structure is.  My second and more pertinent observation was that the RenCen doesnÂ’t really feel like itÂ’s in a city at all, much less one as populous as Detroit. The complex is effectively severed from its surroundings by swirling ribbons of both river and asphalt. To the west sits the Windsor tunnel entrance; to the east, parking lots for nearly as far as the eye can see. To its north is the massive Jefferson Avenue and to its south, the Detroit River. You get the sense that if Henry Ford II and his team of investors had gotten their way, the whole thing would have been built offshore with the swirling channel doubling as a moat. This isnÂ’t a building the draws the city in; itÂ’s one designed to keep it out. Frost on the inside of the RenCen hotel glass. Contrasted with the new Hudson's project GM intends to move into, a mixed-use anchor with residential, office, retail and entertainment offerings smack-dab in Detroit's most vibrant district, the RenCen is a symbol of an era when each office in DetroitÂ’s downtown was an island in a rising sea of dilapidation. Back then, those who fortified against the rapid erosion of DetroitÂ’s urban bedrock stood the best chance of surviving. This was the era that brought us ugly skyways and eventually the People Mover — anything to help suburban commuters keep their metaphorical feet dry. The RenCen offered — and still offers — virtually any necessity and plenty of nice-to-haves, all accessible without ever venturing outside, especially in the winter, but those enticements are geared to those who trek in from suburbia to toil in its hallways.

Junkyard Gem: 1969 Cadillac Coupe DeVille

The Cadillac Division was riding high in 1969, with sales numbers far surpassing those of Lincoln and Imperial. A few more years remained before fuel prices would go crazy, and prosperous Americans knew that a sleek DeVille or Eldorado gave them bragging rights at the country club. Here's a thoroughly used-up '69 Coupe DeVille, finally at the end of its journey and residing in a self-service wrecking yard in Denver, Colo. This inspection certificate shows that the car lived in Louisiana a decade ago. Since this is the sort of pervasive rust that occurs in places much wetter than arid High Plains Colorado, we can assume that this DeVille spent many years in the land of gumbo and alligators. The decklid sports Fleetwood badging and a Rickenbaugh Cadillac emblem, but Cadillac didn't make two-door Fleetwoods in 1969. Perhaps a Colorado-sold Fleetwood donated its decklid to replace a rust-ravaged lid on this car. Actually, there's a good chance it was purchased at this very yard. The once-opulent interior has suffered greatly over the decades, with the reek of mildewed carpeting and irradiated leather giving it That Hooptie Car Smell. Try to picture what this scene looked like in happier days, a half-century ago. The 1969 Cadillac V8 engine displaced a mighty 472 cubic inches (that's 7.8 liters to those of you living under the cruel knout of the metric system) and delivered a gross 375 horsepower and 525 lb-ft of torque. Scaling in at 4,595 pounds (about a half-ton less than a new Escalade), the DeVille needed that power to keep up with those cheap-but-V8-equipped Chevy Chevelles. For 1970, Cadillac would stroke this engine to a staggering 500 cubic inches for Eldorado buyers. This engine family lasted through 1984, after which it was replaced by the much-loathed High Technology V8. The build quality and snob appeal of the 1969 Cadillacs kept them on the road for decades after most of their peers got crushed, but this one was just too far gone to be worth restoring. Featured Gallery Junked 1969 Cadillac Coupe DeVille View 21 Photos Auto News Cadillac Automotive History Classics