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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:    

2015 Chevy Colorado gets its GearOn before Chicago

Complementing the Chevrolet Silverado Midnight Edition at the 2015 Chicago Auto Show is this, the 2015 Colorado GearOn Edition, which as the name might suggest, takes full advantage of the company's truck accessory catalog. Available on the volume LT trim and in both crew and extended cab varieties and with both the short and long-bed options, the GearOn Edition adds plenty of nifty extras designed to increase the truck's versatility and help accommodate bikes, kayaks and other outdoorsy items. The GearOn bars package, divider package and tie-down rings are supplemented an "EZ" lift and lower tailgate, side steps, gloss black 18-inch wheels, a body color grille, and blacked-out Chevy badges. And although it's not specifically called out in the attached press release, the paint on this special edition looks different than anything else in the truck's catalog. We dig it, especially with the black accents. Prices, meanwhile, start at $31,250, which is not even $1,200 more than a Colorado Extended Cab LT 4x4. We'll have more on the Colorado GearOn when it makes its debut later this week at the 2015 Chicago Auto Show, including live images to add to the pair of stocks distributed by Chevy. Until then, scroll down for the press release on the limited-edition truck. Chevy Colorado GearOn™ Edition Brings More Adventure Versatile accessories package maximizes cargo capability; enables more fun DETROIT – Chevrolet today introduced the 2015 Colorado GearOn™ Special Edition, which blends the capability of the all-new midsize pickup truck with the versatility of the GearOn accessory system – and additional popular features. It makes its public debut Feb. 13-22 at the Chicago Auto Show. The Colorado GearOn Special Edition goes on sale this spring with a starting price of $31,250. It's offered on LT models in extended or crew cab configurations, with the long or short cargo bed and available 4WD. "Chevrolet Colorado answers the call for customers who have passions of all types and the GearOn accessory system enables them to bring more adventure wherever they go," said Tony Johnson, Colorado marketing manager. "And with Colorado offering segment-leading efficiency and capabilities, it's a combination that maximizes adventure without compromise." The GearOn accessory system is designed for easy configuration with a multitude of mounting accessories for everything from bikes, kayaks, skis and stand-up paddle boards to a bed-mounted tent.

Nissan Leaf, Chevy Volt have best sales month of 2015

Things are trending upwards for the two best-selling plug-in vehicles in the US. Both the Chevy Volt and the Nissan Leaf had their best sales month of 2015 in May, with the Volt selling 1,618 units and the Leaf moving 2,104. The upward swings come at an interesting time, with lots of excess first-gen Volts waiting for buyers and some buyers already ordering their second-gen Volts. So far in 2015, the Leaf has outsold the Volt 7,742 to 4,397. While 7,700 Leafs is respectable, it's nowhere near the numbers that Nissan will have to hit to reach the 50,000 annual sales that CEO Carlos Ghosn says is possible in the US. Still, the Leaf had its best sales month since December 2014 (when it sold 3,102 units) in May, but last month was still down 32.5 percent compared to May 2014. Despite the smaller overall number, May represents a big positive for Chevy, which has seen sluggish sales for the Volt for a long while now. The 1,618 Volts sold last month are only 3.9 percent lower than the 1,684 sold in May 2014 and May 2015 was the best month for Volt sales since August 2014. Perhaps salesmen are ready to make deals, what with thousands sitting around on dealer lots right now. The next-gen Volt is due this fall, and the order books (in California, at least) opened up this week. Like every month, our full wrap-up of green car sales in the US is coming soon (the VW e-Golf, for example, hit a best-ever high of 410 sales). Until then, feel free to discuss the Volt and Leaf sales figures in the Comments. Green Chevrolet Nissan Electric Hybrid ev sales hybrid sales