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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:    

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. ...

'84 MotorWeek Cherokee, Bronco and Blazer comparison indulges your SUV nostalgia

These days, truck-based, full-frame SUVs are somewhat of a rarity on the auto landscape due to the rapid rise in popularity of easier-driving, car-based crossovers. Although, without the gradually building popularity of these chunky, high-riding vehicles decades ago, it's unlikely that America's roads would be filled with so many CUVs today. In its latest dig into the archives, MotorWeek has found a 1984 comparison test of a trio of these early Sport Utility Wagons, as long-time host John Davis called them, that helped get acceptance of this segment going. This is a red, white and blue test of the SUVs from American automakers at the time and pits the Chevrolet Blazer, Ford Bronco and Jeep Cherokee (specifically in Wagoneer guise) against each other. Driving manners and interior usability are considered in the evaluation, but Motorweek actually takes these vehicles off road, too. Among the bigger revelations is the improvement in on-road ability in the past 30 years. While specific 0-60 times aren't given, all three models take around 10 seconds just to get to around 50 miles per hour in the 500-feet on-ramp acceleration test. Check out this clip to see just how far this segment has progressed in the past three decades or just get a blast of nostalgia from these now vintage models. News Source: MotorWeek via YouTube Chevrolet Ford Jeep SUV Off-Road Vehicles Classics Videos Ford Bronco chevy blazer