Unusually rainy weather prevented us from doing any off-roading ourselves, save for a short ride-along with a GMC engineer through deep mud in which we did not get stuck. That’s admittedly expected in a vehicle with 35-inch mud terrain tires, part of the optional Extreme Off-Road Package, which also adds more underbody armor and underbody cameras.
Like the pickup, GMC is launching the Hummer EV SUV in three-motor form, with one motor powering the front axle and two at the back. Also carrying over (again, as part of the Extreme Off-Road Package) are a front electronic locker and “rear virtual locker,” which uses software to adjust the output of each rear motor to simulate a locked differential, but without the maneuverability penalty of a mechanical locker.
GMC didn’t do a quad-motor powertrain, a la Rivian, because engineers believed the single front motor would be more efficient for on-road highway driving; it does most of the work in that scenario, allowing the rear motors to draw less power. That’s why the Hummer EV still has a conventional locker for the front axle. Forthcoming dual-motor versions will have just one motor at each axle, meaning they’ll do without “virtual” lockers entirely.
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