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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:    

Timothee Chalamet is 'Edgar Scissorhands' in Cadillac's Super Bowl commercial

Filmmaker Tim Burton's 1990s classic "Edward Scissorhands" explored the unusual challenges of a boy who had scissors for hands. One challenge that was not touched on in the original film was that of driving a car. For its Super Bowl commercial, Cadillac revisits the theme, and the brand's Super Cruise hands-free driving feature proves perfectly suited to "Edgar Scissorhands," another young man with scissors for hands. Playing Edgar is Timothee Chalamet, reprising the role that Johnny Depp made famous as Edward. Edgar's mother is portrayed by Winona Ryder. While Edgar's unique hands do give him some special talents — he makes one heck of an artful salad, for instance — they present a challenge in many others, such as playing football. A virtual reality headset affords Edgar the ability to drive, and that gives his mother an idea. She presents him with a Cadillac Lyriq, the not-yet-on-sale EV crossover. Edgar sets the button to activate Super Cruise, and the Lyriq steers itself. The perfect solution for someone with scissors for hands. Why feature a vehicle that doesn't go on sale until late 2022 when Super Cruise is available in other Cadillac models now? The answer seems to be that GM is using its Super Bowl commercials to also showcase its pivot to EVs. Certainly, that's the theme of "No Way, Norway," which stars Will Ferrell along with the Lyriq and the Hummer EV.   Related Video:

2020 Cadillac CT4 Review & Buying Guide | Cadillac recommits to the small sedan

The 2020 Cadillac CT4 is a brand-new entry into the baby luxury sedan space, replacing the ATS. With an excellent rear-wheel-drive chassis and a performance-oriented “V” trim (to be topped by a yet-wilder “Blackwing” model), the CT4 is aimed at the enthusiast end of the segment. Cadillac fields the lone American entry in this class, meaning the CT4Â’s main competitors — the Audi A3, BMW 2 Series Gran Coupe and the Mercedes-Benz A- and CLA-Classes — are all European. However, since it's a bit bigger than those and features a rear-wheel-drive platform (all-wheel drive is available), it's hardly an apples-to-apples situation. The Genesis G70 is perhaps a closer comparable. In any event, the CT4 is a compelling, American alternative that delivers excellent comfort, interior quality and driving dynamics at a price that strongly challenges the various competitors from Europe. What's new for 2020? The Cadillac CT4 is new for 2020, alongside the bigger CT5. You can check out our first drive of the hot CT4-V model for more on CadillacÂ’s new sedan strategy. 2020 Cadillac CT4 View 4 Photos What's the CT4's interior and in-car technology like? The Cadillac CT4 packs the sort of high-quality materials and convenience features one expects from an entry-level luxury model. The seats are comfortable and supportive, and in higher-end models, the front buckets are offered with heat, ventilation and massage features. The CT4 also boasts what GM calls a “sound-optimized” interior coupled with active noise cancellation and amplification to mitigate unpleasant frequencies and enhance desirable ones. In all, we find the CT4Â’s interior much more compelling than that found in other recent Cadillac products such as the new XT4 crossover. The infotainment system is controlled by an 8-inch touchscreen with an optional rotary-control interface. The base setup includes Android Auto, Apple CarPlay and Amazon Alexa integration and offers USB Type-A and Type-C connectivity and charging. Upgrades include navigation and multiple Bose audio packages, all of which bring with them wireless device charging. How big is the CT4? Like many of CadillacÂ’s previous sport sedans, the CT4 is a bit of an oddball size-wise for the segment it targets, stretching more than a foot longer than the Audi A3 and nearly 9 inches longer than the BMW 2 Series Gran Coupe. However, this doesn't translate into a comparable interior space advantage because of the CT4 rear-wheel-drive platform.