2007 Gmc Sierra Denali Base Crew Cab Pickup 4-door 6.2l on 2040-cars

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GM exploring ways to raise half-ton Duramax diesel tow rating

Lots of truck owners cheered when GM announced fuel economy numbers for the 2020 Chevrolet Silverado with the 3.0-liter Duramax diesel inline-six. Even after Ram let loose its EPA mileage ratings for the 2020 Ram 1500 EcoDiesel, the Chevy oil-burner still took the trophy. The victory was years in the making, GM engineers spending an entire four-year development cycle refining the LM2 Duramax to increase mileage. The tradeoff, as well all know by now, is towing; the Duramax in half-ton duty pulls a maximum 9,300 pounds in the Silverado. Rivals across town can do more, the Ford F-150 PowerStroke rated at 11,500, the Ram 1500 EcoDiesel game to pull 12,560. GM engineer John Barta told Muscle Cars & Trucks that more hauling chops could be on the way, explaining, "We’re actually looking at upgrading some of the materials around (the engine bay) to see if we can maybe raise our tow rating." Engine bay materials are at issue due to thermal complexities underhood. John Barta, GM's assistant chief engineer of diesel engine controls, said the Duramax's inline-six configuration allowed engineers to get emissions hardware like the combined selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filter unit closer to the engine, where it heats up quicker, getting emissions down quicker. But that filter puts another heat source in those confines, enforcing a cap on the tow rating to keep the engine and other systems from overheating. "If you look under the hood," he said, "youÂ’ll see a significant amount of silver ‘moon tapeÂ’ around to make sure things arenÂ’t getting overheatedÂ… if we were to go up in higher towing, which we can, we start impacting the possibility of deteriorating some of the components.” There isn't much space for more grille, so swapping for a better grade of "moon tape" or a different kind of material could reduce engine bay heat, extracting a higher tow rating in the process.  It's important to note a point Barta's been making for months about the Duramax figures, though. "Even though itÂ’s nice to brag about big numbers, in reality, light duty customers are not towing that large with their trucks," and, "We do know that (95 percent) of our light duty customers donÂ’t tow over 9,000 pounds." On our First Drive of the 2020 Silverado diesel we called out the tow rating, but emphasized that the Chevy and GMC have more important challenges to overcome.

GMC Hummer EV's taillights cost thousands to replace

The GMC Hummer EV pickup hasn’t stopped raising eyebrows since GM pulled back the curtain on the behemoth in Spring 2021. ItÂ’s huge, not all that efficient, and unbelievably expensive, but now weÂ’re learning how much replacement parts cost for the new EV. The Drive dug up a post from the Hummer EV Facebook page that claimed a taillight replacement for the vehicle costs thousands to replace. General Motors confirmed pricing to the publication, quoting a one-side replacement cost of $3,045.48. That adds up to more than $6,000 to replace both, so we hope your insurance is solid if you own one. Why would a taillight housing cost that much? Part of the cost comes from the fact that GM couldnÂ’t parts-share its way through the design of a $100,000 flagship electric SUV, but most of the price comes from the complexity of the lights. The Hummer offers elaborate lighting sequences that require microchips and other components, all of which cost money. ThereÂ’s also the fact that the Hummer EV is too new for General Motors to take advantage of its usual economies of scale in mass-produced vehicles. General Motors recalled the Hummer EV earlier this year for issues with the taillights. Though the problem was software-related, GM had to replace the entire light units because the software controlling them was actually embedded in the lights. ItÂ’s true that there are very few vehicles that are tall and large enough to impact the HummerÂ’s taillights, but we hope the owners of those vehicles never have to file an insurance claim to replace one. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

2014 GMC Sierra [w/video]

Big And Boxy Might Be Best
As immense fans of the Back to the Future trilogy, we sometimes like to envision an alternate timeline in which General Motors had killed off GMC and kept Pontiac instead. The G8 GXP would still be on the road handily beating German sport sedans costing twice as much, while the lowly G3 would morph into a true subcompact-killer based on what is now the Chevrolet Sonic RS. While we're at it, let's go ahead and imagine the G6 has become the best-selling car in the US and the Torrent crossover is selling 20,000+ units per month. Far-fetched, we know.
The thing is, these fanciful statements would have to be true to make the case against keeping GMC. Pontiac may have offered more excitement than GMC, but money talks, and a full line of trucks, crossovers and SUVs have made a lot more money for GM than the arrowhead brand ever did. How much? As we learned last month, about two-thirds of GM's global profits came from its fullsize trucks, and GMC's trucks typically have thicker margins than their Chevrolet counterparts.