MECHANICAL Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.) GVWR, 11,700 lbs. (5307 kg) with single rear wheels (Included and only available with model TK30943 model and (L8T) 6.6L V8 gas engine. Requires single rear wheels.) Air filter, heavy-duty Air filtration monitoring Transfer case, two-speed electronic shift with push button controls (Requires 4WD models.) Cooling, external engine oil cooler Cooling, auxiliary external transmission oil cooler Battery, heavy-duty 720 cold-cranking amps/80 Amp-hr maintenance-free with rundown protection and retained accessory power (Included and only available with (L8T) 6.6L V8 gas engine.) Alternator, 170 amps (Requires (L8T) 6.6L V8 gas engine.) Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section Suspension Package (Not available with (X31) Off-Road Package.) Brake lining wear indicator Capless Fuel Fill (Requires (L8T) 6.6L gas V8 engine. Not included with (ZW9) pickup bed delete.) --- EXTERIOR Single Rear Wheels Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door (Deleted with (ZW9) pickup bed delete.) Bumper, front chrome lower Bumper, rear chrome with bumper CornerSteps CornerStep, rear bumper Bed Step, Black integrated on forward portion of bed on driver and passenger side (Not available with (ZW9) pickup bed delete.) Moldings, beltline, Black Cargo tie downs (12), fixed, rated at 500 lbs per corner Grille, Chrome with flat black grille insert bars Taillamps, LED Signature Tail, Incandescent Brake, Turn & Reverse Lamps (Requires single rear wheels.) Lamps, cargo area, cab mounted integrated with center high mount stop lamp, with switch in bank on left side of steering wheel Mirrors, outside high-visibility vertical trailering lower convex mirrors, manual-folding/extending (extends 3.31" [84.25mm]), molded in Black (Not available on Regular Cab models.) Glass, solar absorbing, tinted Door handles, Black grained Tailgate, standard (Deleted with (ZW9) pickup bed delete.) Tailgate and bed rail protection caps, top (Deleted with (ZW9) pickup bed delete.) Tailgate, locking, utilizes same key as ignition and door (Included and only available with (QK1) standard tailgate. Deleted with (ZW9) pickup bed delete.) Tailgate, gate function manual, no lift assist (Deleted with (ZW9) pickup bed delete.) --- ENTERTAINMENT Audio system feature, 6-speaker system (Requires Crew Cab or Double Cab model.) --- INTERIOR Seat adjuster, driver 4-way manual Seat adjuster, passenger 4-way manual Steering wheel, urethane Instrument cluster, 6-gauge cluster featuring speedometer, fuel level, engine temperature, tachometer, voltage and oil pressure Driver Information Center, 3.5" diagonal monochromatic display Exterior Temperature Display located in radio display Compass, located in instrument cluster Window, power front, drivers express up/down Air vents, rear (Not available with Regular Cab model.) Mirror, inside rearview, manual tilt Assist handles, front A-pillar mounted for driver and passenger, rear B-pillar mounted GMC Connected Access capable (Included and only available with (UE1) OnStar. Subject to terms. See onstar.com or dealer for details.) --- SAFETY Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching (Deleted with (ZW9) pickup bed delete.) Following Distance Indicator (Included and only available with (PDI) Sierra HD Pro Safety.) Rear Seat Reminder (Requires Crew Cab or Double Cab model.) Seat Belt Adjustable Guide Loops, front row only (Included and only available on Crew Cab and Double Cab models. Not available with (ZW9) pickup bed delete.) Indicator-Seat Belt WARNING, Rear Seat (Requires Crew Cab or Double Cab model.) Buckle to Drive prevents vehicle from being shifted out of Park until driver seat belt is fastened; times out after 20 seconds and encourages seat belt use (Included and only available with (PDI)