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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 may kill 6 car models as it works with UAW to tackle sales slump

The president of the United Auto Workers union said on Thursday the union is talking with General Motors about the potential threat to plants and jobs from slumping U.S. car sales. GM's response will be more trucks and SUVs, and sources say at least six slow-selling car models may be killed off. "We are talking to (GM) right now about the products that they currently have" at underused car plants such as Hamtramck in Michigan and Lordstown in Ohio, and whether they might be replaced with newer, more popular vehicles such as crossovers, Dennis Williams told reporters. "We are tracking it (and) we are addressing it," Williams added. GM has cut shifts at several U.S. plants this year as inventories of unsold cars have ballooned. Industry analysts said more jobs could be at risk as the automaker wrestles with permanently shrinking production of small and midsized sedans. GM is reviewing whether to cancel at least six passenger cars in the U.S. market after 2020, including the Chevrolet Volt hybrid, which could be replaced in 2022 with a new gasoline-electric crossover model, Reuters has learned from people familiar with the plans. Other GM cars at risk include the Buick LaCrosse, Cadillac CT6, Cadillac XTS, Chevrolet Impala and Chevrolet Sonic, sources said. Some analysts have singled out GM's Hamtramck plant in Detroit as one of the most vulnerable because of plummeting car sales. The plant, which opened in 1985, builds four slow-selling models: Buick LaCrosse, Chevrolet Impala, Cadillac CT6 and Chevrolet Volt. In the first half, it built fewer than 35,000 cars, down 32 percent from the same period in 2016, according to suppliers familiar with GM's U.S. production schedule. The typical GM assembly plant builds 200,000-300,000 vehicles a year.COMING ATTRACTIONS: TRUCKS AND SUVS GM must "create some innovative new products" to replace slow-selling sedans "or start closing plants," said Sam Fiorani, vice president of AutoForecast Solutions. The auto maker already has begun to shift future production plans from cars to trucks, according to Morgan Stanley auto analyst John Murphy. He estimates that fewer than 10 percent of the new vehicle models that GM will introduce over the next four years will be passenger cars, with the rest divided among trucks, SUVs and crossovers. GM plans to add production of the new Cadillac XT4 crossover next year to its Malibu sedan plant in Fairfax, Kansas.

Chevy 'committed to marketing Bolt the right way'

The 2015 edition of the annual AltCar Expo in Santa Monica, CA in September was a relatively quiet affair. Attendance felt light compared to previous years. But that didn't mean there wasn't something happening that might have just as big an impact on the plug-in scene as anything that's ever happened in previous years at the Santa Monica Convention Center. I say this because of what GM's Shad Balch told me about Chevy's plans to market the upcoming Bolt electric car. This is GM's next-gen electric vehicle, which will have a roughly 200-mile range and may cost about $30,000 after tax incentives (maybe). To say he's excited to start selling this car is an understatement. Set aside the obvious challenge Chevy will have with cars named both the Volt and the Bolt, especially when some languages exchange the pronunciation of the letters B and V. Set aside the fact that, for now, Balch is dealing with his own company actively advertising against the product he's trying to get people excited about. Balch, GM's manager of new product and public policy communications, is tremendously positive about the Bolt's chances in the marketplace when it arrives in 2017 or 2018. "Driving an EV is, in every proof point, better than a gas-powered car, except for charging." - Shad Balch AltCar and the concurrent National Drive Electric Week represented the Bolt's West Coast debut, and Balch told me that the car's arrival in California shows how "Detroit recognized that they need to send it out to their number one market." The car's appearance outside of the Motor City was "The most encouraging part for us out here, being in the market ... to be able to explain that we are committed to marketing this car the right way. ... We're trying to make that known as much as possible, because that is the number one criticism that we hear. That's why events like these are so important, because we can't wrap up into a 30-second spot what these cars are capable of. I can't even explain it to you in 10 minutes what it's like. But the thing is, driving an EV is, in every proof point, better than a gas-powered car, except for charging." Now, there's a fairly decent chance that GM will hit the 250,000-vehicle limit for the $7,500 federal tax incentive right about when the Bolt comes to market, so I had to ask how the Bolt gets marketed if the price tag jumps up a few thousand dollars. Balch was straightforward. "Well, we would sell fewer cars," he said. "It's pure and simple. ...