![]() With the updated 6.6-liter Duramax diesel, GMC says it'll tow up to 18,500 pounds. It also gets beefier skid plates - both the steel protecting the transfer case and the aluminum piece up front. Key upgrades include a 1.5-inch factory lift, standard electronic locking rear differential, Multimatic DSSV shocks and 35-inch Goodyear Territory all-terrain tires. If you paid any attention at all to the Silverado HD ZR2's introduction earlier this month, you'll be familiar with the formula. ![]() GMC's Sierra AT4X models mirror the ZR2 packages offered on the updated Chevrolet Silverado. Well, two trims, technically, as GMC took the opportunity to announce that the AT4X will also be offered with an upfit package from American Expedition Vehicles, appropriately named the Extreme AEV Edition that takes its cues from the same package offered on the Sierra 1500 AT4X. And with its introduction, the 2024 GMC Sierra HD lineup is now complete. The new AT4X variant of GMC's 2024 Sierra HD pickup series officially joins the stable this week, giving pickup truck box-checkers yet another off-road trim to chase. ![]()
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