MIRRORS, OUTSIDE POWER-ADJUSTABLE VERTICAL TRAILERING with heated upper glass, lower convex mirrors, integrated turn signals, manual folding/extending (extends 3.31 [84.25mm]), Black (Standard on Regular Cab models. Included and only available with (PCI) Convenience Package or (ZLQ) Fleet Convenience Package.) ,AUDIO SYSTEM, GMC INFOTAINMENT SYSTEM WITH 7 DIAGONAL COLOR TOUCH-SCREEN, AM/FM STEREO with seek-and-scan and digital clock, includes Bluetooth streaming audio for music and select phones; featuring wired Android Auto and Apple CarPlay capability for compatible phones (STD) ,ENGINE, 6.6L V8 with Direct Injection and Variable Valve Timing, gasoline, (401 hp [299 kW] @ 5200 rpm, 464 lb-ft of torque [629 N-m] @ 4000 rpm) (STD) ,TRANSMISSION, 10-SPEED AUTOMATIC (STD) ,CONVENIENCE PACKAGE includes (AKO) tinted glass, (C49) rear-window defogger and (DBG) power trailer mirrors with heated upper glass and manual extending/folding (Requires (KI4) 120-volt power outlet. Not available with (ZLQ) Fleet Convenience Package.) ,LPO, BLACK ASSIST STEPS (dealer-installed) (Not available with any other RPO or LPO assist step.)