including GM's Rear Seat Reminder, and Teen Driver Mode. eAssist Mild Hybrid Starting in 2016, GM offered an eAssist mild hybrid version of the 5.3-liter V8 engine in the Silverado LT and Sierra SLT, but only in the state of California. The engine came with an 8-speed automatic transmission and has the same horsepower and torque as the regular 5.3 V8. For 2017, it was also available in Hawaii, Oregon, Texas, and Washington. For 2018, it became available nationwide and was also offered in the Silverado LTZ. Silverado SSV In late 2014, Chevrolet released the 2015 Silverado SSV (Special Service Vehicle) to complement its lineup of law enforcement vehicles. The SSV Silverado is available in 1500 Crew Cab form with either the short (5.5') or standard (6.5') cargo box. The 5.3-liter EcoTec3 V8 is the only engine option, and the truck is based on WT trim. It features beefier brake rotors, upgraded oil coolers, high output alternator, auxiliary battery and an upfitter friendly interior. Special editions GMC In 2016, GMC introduced the Sierra All Terrain X, which is equipped with a 5.3-liter V8 engine with performance exhaust, increasing power from . On the exterior, the Sierra All Terrain X features black 18-inch rims fitted with larger 265/65R18SL Goodyear Wrangler Duratrac MT tires, black bed-mounted sport bar, LED off-road lights, and blacked-out accents. After introducing the Sierra 1500 All Terrain X full-size pickup and the Canyon All Terrain X small pickup, in 2017 GMC extended the same formula to its heavy-duty pickup family with the Sierra HD All Terrain X. Available on four-wheel drive Sierra 2500 HD crew cab models come in either Black Onyx or Summit White exterior colors. All Terrain X models have a body-color grille surround and a grille insert that's unique to All Terrain. Body color door handles, front and rear bumpers, and bodyside moldings, and black accents, including belt moldings, front bumper skid plate, and B-pillar accents, give it a monochromatic appearance. Sierra HD All Terrain X models also include eighteen-inch black-painted aluminum wheels – fitted with LT275/65R18 Goodyear Duratrac MT-rated tires – along with four-inch black sport side steps, black heated and power-folding trailering mirrors with integrated turn signals and LED guidance lamps, a spray-on bedliner, and a black bed-mounted sport bar, which is designed to support available GMC Accessories LED off-road driving lamps. Inside, the 2017 Sierra 2500 HD All Terrain X has GMC