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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 light refresh shown in China ahead of U.S. reveal

We spied the lightly refreshed 2020 Cadillac XT5 not too long ago, but now we have official photos via China. Cadillac decided to reveal the mid-cycle refresh of its crossover on that side of the world, so the vehicle you're looking at here is a China-spec XT5. While this may be the case, many of the details unmasked about the vehicle will likely be seen here, too. Cadillac told us it will be able to confirm U.S. specifics in the near future. You may be wondering, what's different? Truthfully, there isn't much to the mid-cycle update from a visual perspective. The grille has been swapped for one that better matches all the other grilles in Cadillac's newest crossovers like the XT4 and XT6. Cadillac of China didn't include any photos of the rear for this light reveal. There are significant updates in other places, though. At least in China, Cadillac is giving the XT5 its new 2.0-liter turbocharged four-cylinder engine we first saw in the XT4. That engine produces a refined 237 horsepower and 258 pound-feet of torque. We can't say whether the crossover will or won't keep the 3.6-liter V6 option in the states, but adding the boosted motor won't come as a surprise. Along for the ride is GM's nine-speed automatic transmission that is paired to that four-cylinder. The interior looks largely the same, save for the addition of Cadillac's rotary knob to control the infotainment system. This follows suit with other newly-released Cadillacs that allow you to control the system with both the knob and the touchscreen. Another notable interior upgrade is the addition of the rearview mirror camera. Cadillac is clearly set on integrating this technology onto every car it makes, and we certainly don't have any qualms with that. One bit of tech that wouldn't be included for China but may present itself for the U.S. model is Super Cruise. We've been told to expect the driver assistance system to spread throughout the manufacturer's lineup, and the XT5 seems a perfect candidate for the tech. Watch out for more details and photos coming soon for the 2020 XT5, as Cadillac will be sharing more specifics on the U.S. version in due time.

Reuss says GM diesel plans are still on pace

General Motors is not going to let Volkswagen's diesel emissions scandal ruin its plans for a new line of efficient, torquey oil-burners, the company's Executive Vice President Mark Reuss said at a recent press event. "No way," Reuss responded when asked about cancelling the upcoming diesel-powered Chevrolet Cruze and other vehicles. "The Cruze Diesel is too good not to do it." Slated for 2017, the compact is just the latest member of a diesel offensive that initially kicked off with the first Cruze Diesel and most recently saw the introduction of the oil-burning Chevy Colorado and GMC Canyon. Reuss also reassured those in attendance that there was "no delay" in development of Cadillac's diesel lineup. Cadillac is working on a line of four- and six-cylinder turbodiesels for Europe. They'd make their way into the US market, too, eventually. "It's a question of timing," Reuss said, according to Car and Driver. Volkswagen's diesel emissions scandal has caused automakers across the globe to at least reanalyze their diesel strategy. Jaguar Land Rover, which is preparing several diesel-powered models for the US market, went on record late last month to reaffirm its commitment to diesel. Related Video: Featured Gallery 2014 Chevrolet Cruze Turbo Diesel: Quick Spin View 14 Photos News Source: Car and DriverImage Credit: Copyright 2015 Seyth Miersma / AOL Green Cadillac Chevrolet GM Diesel Vehicles