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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:    

2020 Cadillac XT5 spied undisguised with infotainment from CT5

The reveal of the 2020 Cadillac XT5 crossover must be seriously near, because one of our spy photographers caught the new one completely undisguised. Seriously, there aren't any vinyl coverings anywhere, and the interior was completely bare, too. The update is minimal for the most part, but the interior reveals a big infotainment change. Before we get inside, we'll do a quick overview of the exterior. The front grille has a new mesh insert, and the lower air dam has a wider, thinner metallic accent. At the back, the colors for the faux skid plate or diffuser motif have been swapped. And that's it for the exterior. See? Told you it would be quick. The interior is nearly unchanged, too, except for the aforementioned infotainment system. Instead of the current model's touchscreen-only interface, the new XT5 adopts the control knob featured in the XT4, XT6 and CT5. It fits quite naturally behind the electronic shift lever. If it's like the system in other Cadillacs, fans of the touchscreen shouldn't worry, because you'll still be able to use the touch functions if you wish. Odds are we're months away from the new XT5 hitting dealers, since this is clearly a finished prototype. It will most certainly offer the same 3.6-liter, 310-horsepower V6 and 8-speed automatic of the current model. It's possible Cadillac will introduce a slightly more affordable 2.0-liter turbocharged inline-4 as an option, possibly even a turbo inline-4 hybrid powertrain, since both powertrains are available on the current Chinese-market XT5.

Cadillac confirms Blackwings will get manual transmissions and 3D-printed parts

Cadillac's upcoming 2022 CT4-V and CT5-V Blackwing will be the first GM production cars to utilize 3D-printed technology. In fact, the technology will be featured front and center on one of the cars' most hotly anticipated features — in a decorative medallion atop the shift knob of the manual transmission. Cadillac says that "additive manufacturing" (named as such because 3D printing accumulates tiny deposits of material to create the object) made the manual transmissions possible by reducing costs and waste. Aside from the medallion, the cars will employ two 3D-printed two HVAC ducts and an electrical harness bracket. "[The manual transmission is] something we know V-Series buyers want and itÂ’s something we knew we had to have, so we used innovative processes to make it happen,” said Cadillac performance variant manager Mirza Grebovic. Speaking of which, Cadillac commissioned a Harris Poll survey about manual transmissions and received some interesting results. For example, 66 percent of American adults surveyed know how to drive manual, and 55 percent said they've owned a standard shift car. Of those who don't, roughly 40 percent are either somewhat or very interested in learning. Interest is highest among two key demographics, 64 percent of those earning $75,000 or more in annual household income, and 62 percent of those ages 18-34. The findings seem to contradict what many automakers have said about lack of interest in manuals, with some declaring a sub-1 percent take rate when manuals are offered. Perhaps with a performance-oriented car such as the V-series, buyer preferences change. The mix of old school gearboxes and new school manufacturing techniques will result in what looks like a very potent car on paper. The CT5-V Blackwing is rumored to be powered by an updated 6.2-litter V8, while the CTS-4 Blackwing is said to be motivated by a turbo six. Neither will use the twin-turbo 4.2-liter V8 of their namesake, but they should prove to be worthy successors to the CTS-V and ATS-V. Related Video: