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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:    

Cadillac confirms 420-hp twin-turbo V6 for 2014 CTS [w/videos]

The 2014 CTS will break cover next week at the New York Auto Show, but Cadillac has released a few details of what we can expect to find under the car's hood. As we saw in some spy shots back in January, the biggest news for the midsize Caddy will be a twin-turbocharged V6 producing a whopping 420 horsepower and 430 pound-feet of torque.
This LF3 engine will be paired to a new eight-speed automatic transmission, which will help balance performance and fuel economy. We still don't know how much the 2014 CTS has grown in terms of size and weight, but General Motors says that new sedan will return 17 miles per gallon in the city and 25 mpg highway with the new engine to go with a 0-60 mile per hour time of 4.6 seconds - that means the new CTS will have the fuel economy close to the current base model sedan and acceleration not too far from the current CTS-V. General Motors also confirmed that this twin-turbo V6 will be available in the 2014 XTS this fall.
The next-generation CTS will carry over the 3.6-liter V6 from the current car (likely as a base engine) and also add the 2.0-liter turbo four-cylinder from the ATS. Check out all the details on this new engine and watch a few videos (including GM's nifty tilt rig) by scrolling below.

Cadillac CT4 and CT4-V pricing revealed, starts just under $34,000

The Cadillac CT4-V had its big reveal in Detroit several months ago, and last month we finally saw the regular CT4. Today, Cadillac has pricing available for every CT4 trim level including the V. The entry-level CT4 Luxury with rear-wheel drive will start at $33,990, including the destination charge. Adding all-wheel drive requires another $2,600, bringing the total to $36,590. Cadillac also throws in heated front seats and a heated steering wheel when you opt for the all-wheel drive model. The CT4-V comes in at $45,490 before options — on the V, the up-charge for all-wheel drive is only $1,100. Cadillac CT4-V View 12 Photos Cadillac offers two trims in between the base Luxury and more powerful V-Series: Premium Luxury and Sport. The Premium Luxury is priced from $38,490, and the Sport is a tad bit more expensive at $39,590. All-wheel drive is even more expensive ($3,200) in the Premium Luxury, as it adds cooled front seats on top of the heated seats and steering wheel. The cooled seats arenÂ’t included with the Sport all-wheel drive package, so itÂ’s the same $2,600 charge as in the Luxury model. Every CT4 but the V comes standard with CadillacÂ’s 2.0-liter turbocharged four-cylinder that makes 237 horsepower and 258 pound-feet of torque. An 8-speed transmission handles the shifting. Go for the much more expensive CT4-V, and you get the 2.7-liter turbo four that makes 325 horsepower and a whopping 380 pound-feet of torque. This engine is exclusively mated to a 10-speed automatic. For a full rundown and background on the CT4 and CT4-V, check out our previous coverage of the cars. YouÂ’ll be able to order a 2020 CT4 later this year.