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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:    

Combative de Nysschen defends Cadillac move, naming change

Johan de Nysschen isn't afraid of taking quick, decisive actions, even if they are criticized. Since taking the wheel at Cadillac, he instigated moving the luxury division's base of operations to Manhattan's SoHo neighborhood and introduced a new naming scheme for the future of the brand, like he did at Infiniti. The polarizing boss recently explained his feelings about the future of Cadillac in more depth on his Facebook page, but unfortunately only his friends could read it. Thankfully, Daily Kanban posted much of the strongly worded missive for the whole world to see.
Much of the message examines the decision to move some employees to New York. De Nysschen claims that it's all about giving Cadillac distance from Detroit to reshape itself. It allows for, "No distractions. No side shows. No cross-brand corporate considerations. No homogenized lowest common denominator approach. Just pure, unadulterated, CLASS."

Junkyard Gem: 1976 Cadillac Eldorado Convertible

Convertibles rode high well in 1960s America, with Detroit selling more than 500,000 ragtops in 1965, but sales collapsed by the early 1970s and tightening federal crash-safety regulations made it seem less worthwhile to even bother producing new ones. Chrysler halted convertible production after 1971, with Ford following suit by 1973. By the 1976 model year, the Cadillac Eldorado was the last new American car you could buy with a convertible top from the factory, and it appeared that none would ever be built again. I've found one of those "last convertible" Eldorados in rough-but-identifiable condition in a Denver junkyard. As it turned out, the convertible never really died in America. Car shoppers could still buy new European-made convertibles after 1976, coachbuilders modified new Detroit cars with factory-grade drop-tops, and then Chrysler began selling K-Car convertibles starting with the 1982 model year. Because the '76 Eldorado appeared to be the absolute end of the convertible line, however, buyers thought they were investing in a sure-fire collector car that would be worth vast sums in the not-very-distant future (this belief led to lawsuits against GM later on, when the Cadillac Division resumed production of the Eldorado convertible for 1984). While a one-of-200-made Bicentennial Edition Eldorado with red-white-and-blue trim really is worth plenty these days, an ordinary 1976 Eldorado in beat-up condition doesn't seem worth restoring. This car appears to have sat outside in Colorado with the top down for decades, filling with snow each winter and enduring high-elevation solar irradiation each summer. A 1960s GTO or Camaro might be worth fixing up after falling into this state of disrepair, but not one of 14,000 "last convertible" Eldorados made in 1976. GM's Unified Powerplant Package front-wheel-drive system, which used battleship-strength chains to transmit power to the drive wheels, proved to be extremely reliable on the street, joining the small-block Chevrolet engine and Hydra-Matic transmission in the pantheon of The General's Greatest Engineering Hits. Even gigantic motorhomes used this system. In 1976, the Eldorado got the last of the 500-cubic-inch (8.2 liter, or litre as GM's marketers spelled it) V8s, rated at a disappointing 190 horsepower and an impressive 360 lb-ft of torque.