2021 GMC SIERRA 2500HD AT4

• StabiliTrak, stability control system with Proactive Roll Avoidance and traction control, includes electronic trailer sway control and hill start assist
• Airbags, Dual-stage frontal airbags for driver and front outboard passenger; Seat-mounted side-impact airbags for driver and front outboard passenger; Head-curtain airbags for front and rear outboard seating positions; Includes front outboard Passenger Sensing System for frontal outboard passenger airbag (Always use seat belts and child restraints. Children are safer when properly secured in a rear seat in the appropriate child restraint. See the Owner's Manual for more information.)
• Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching
• Teen Driver a configurable feature that lets you activate customizable vehicle settings associated with a key fob, to help encourage safe driving behavior. It can limit certain available vehicle features, and it prevents certain safety systems from being turned off. An in-vehicle report card gives you information on driving habits and helps you to continue to coach your new driver

PACKAGE (2)

• X31 Off-Road Package includes (JHD) Hill Descent Control, (NZZ) skid plates, Off-Road suspension and Twin-tube Rancho shocks
• ProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (U1D) In-vehicle Trailering App

MECHANICAL (23)

• 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)
• Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)
• GVWR, 10,650 lbs. (4831 kg) (Included and only available with TK20743 model and (L8T) 6.6L V8 gas engine with 18" or 20" wheels or TK20943 and (L8T) 6.6L V8 gas engine with 17" wheels.)
• Hill Descent Control
• Transfer case, two-speed active, electronic Autotrac with push button control
• Auto-locking rear differential
• Four wheel drive
• Cooling, external engine oil cooler
• Cooling, auxiliary external transmission oil cooler
• Air filter, heavy-duty
• Air filtration monitoring
• 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.)
• Trailer brake controller, integrated
• In-vehicle Trailering App, System includes checklist, trailer maintenance reminders, trailer security alerts, trailer mileage, tow/haul reminder, trailer electrical diagnostics and Trailer Tire Pressure Monitor System module (Includes trailer tire pressure monitoring alert ONLY when (PTT) trailer tire pressure monitor system is factory ordered and sensors are installed.)
• Recovery hooks, Red
• Skid Plates protect the oil pan, front axle and transfer case
• Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
• Suspension, Off-Road includes twin-tube shocks
• Steering, Digital Variable Steering Assist This system automatically adjusts steering based on speed, road conditions, and other inputs to reduce driver effort and fatigue
• Brakes, 4-wheel antilock, 4-wheel disc with DURALIFE rotors
• Brake lining wear indicator
• Capless Fuel Fill (Requires (L8T) 6.6L gas V8 engine.)

EXTERIOR (22)

• Tire, spare LT275/70R18 all-terrain, blackwall
• Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
• Bumper, front, body-color lower
• Bumper, rear body-color with bumper CornerSteps
• CornerStep, rear bumper
• Bed Liner, Spray-on, Pickup bedliner with GMC logo (does not include spray-on liner on tailgate due to Black composite inner panel) (AT4 logo replaces GMC logo. Not available with any Ship Thrus EXCEPT (VSH), (VTV), (TCH) or (TCE).)
• Bed Step, Black integrated on forward portion of bed on driver and passenger side
• Cargo tie downs (12), fixed rated at 500 lbs per corner
• Wheelhouse liners, rear
• Moldings, beltline, Black
• Grille (Painted Black surround with high gloss Black mesh and Black chrome inserts.)
• Fog lamps, LED
• Lamps, cargo area cab mounted integrated with center high mount stop lamp, with switch in bank on left side of steering wheel
• LED Cargo Area Lighting located in cargo bed activated with switch on center switch bank or key fob
• Taillamps, LED signature taillight with LED stop and reverse light
• Mirrors, outside power-adjustable vertical trailering with heated and auto-dimming upper glass, (driver and passenger) lower convex mirrors, turn signal indicators, puddle lamps, perimeter lighting, auxiliary lighting, power folding/extending (extends 3.31" [84.25mm]) (Molded in color Black.)
• Mirror caps, high gloss Black
• Glass, deep-tinted
• Door handles, body-color
• Tailgate, GMC MultiPro Tailgate with six functional load/access features
• Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
• Tailgate and bed rail protection caps, top

ENTERTAINMENT (3)

• Radio, HD
• Audio system feature, 6-speaker system
• 4G LTE Wi-Fi Hotspot capable (Terms and limitations apply. See onstar.com or dealer for details.)

INTERIOR (27)

• Seat adjuster, driver 10-way power including lumbar
• Seat adjuster, passenger 10-way power including lumbar
• Driver memory recalls driver "presets" for power driver seat and outside mirrors
• Seats, heated second row outboard seats
• Seat, Up-level Rear with Storage Package, 60/40 folding bench for Crew Cab models, includes full-length bench seat, seatback storage on left and right side, center fold out armrest with 2 cupholders, full cab width under-seat storage, (includes child seat top tether anchor)
• Center Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability
• Floor covering, color-keyed carpeting
• Steering wheel, leather-wrapped
• Steering wheel, heated
• Steering wheel audio controls
• Steering column, manual Tilt-Wheel and telescoping
• Steering column, lock control, electrical
• Instrument cluster, 6-gauge cluster featuring speedometer, fuel level, engine temperature, tachometer, voltage and oil pressure
• Driver Information Center, 4.2" diagonal color display includes driver personalization
• Exterior Temperature Display, located in radio display
• Compass, located in instrument cluster
• Rear Seat Reminder
• Remote vehicle starter system
• Cruise control, steering wheel-mounted
• Theft-deterrent system, unauthorized entry
• Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
• USB ports, dual, charge-only (2nd row)
• Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
• Air conditioning, dual-zone automatic climate control
• Air vents, rear
• Assist handles front A-pillar mounted for driver and passenger, rear B-pillar mounted
• GMC Connected Access capable (Subject to terms. See onstar.com or dealer for details)

LPO CONSOLE-MOUNTED SAFE (dealer-installed)	LPO CARGO CONVENIENCE PACKAGE includes (S1O) Console-Mounted Safe LPO and (VBJ) rear under seat storage LPO (dealer-installed)
LPO SPORT STEP BLACK (dealer-installed)	LICENSE PLATE KIT FRONT
JET BLACK WITH KALAHARI ACCENTS PERFORATED FRONT LEATHER SEAT TRIM	WHEELS 20" (50.8 CM) MACHINED ALUMINUM with high gloss Black accents
TRANSMISSION 6-SPEED AUTOMATIC HEAVY-DUTY (STD)	GVWR 10 650 LBS. (4831 KG) (STD)
AUDIO SYSTEM PREMIUM GMC INFOTAINMENT SYSTEM WITH 8" DIAGONAL COLOR TOUCH-SCREEN includes multi-touch display AM/FM stereo Bluetooth streaming audio for music and most phones; featuring wireless Android Auto and Apple CarPlay capability for compatible phones advanced voice recognition in-vehicle apps personalized profiles for infotainment and vehicle settings (STD) (Includes (PZ8) Hitch Guidance with hitch view.)	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)
SEATS FRONT BUCKET with center console (STD)	AT4 PREFERRED EQUIPMENT GROUP includes standard equipment
LPO ALL-WEATHER FLOOR LINERS 1ST AND 2ND ROWS (includes AT4 logo)	LPO REAR UNDERSEAT STORAGE COMPOSITE STORAGE BIN Crew Cab includes lockable lid (dealer-installed)
PICKUP BED includes bed assist step (STD)	REAR AXLE 3.73 RATIO
PACIFIC BLUE METALLIC	TIRES LT275/65R20 ALL-TERRAIN BLACKWALL
Tow Hitch	Running Boards/Side Steps
Locking/Limited Slip Differential	Four Wheel Drive
Tow Hooks	Power Steering
ABS	4-Wheel Disc Brakes
Aluminum Wheels	Tires - Front All-Terrain
Tires - Rear All-Terrain	Conventional Spare Tire
Bed Liner	Daytime Running Lights
Fog Lamps	Heated Mirrors
Power Mirror(s)	Integrated Turn Signal Mirrors
Power Folding Mirrors	Privacy Glass
Integrated Tailgate Step	AM/FM Stereo
MP3 Capability	Bluetooth Connection
Auxiliary Audio Input	Smart Device Integration
HD Radio	Satellite Radio
Requires Subscription	Satellite Radio
Requires Subscription	Bluetooth Connection
Bluetooth Connection	Smart Device Integration
WiFi Hotspot	Bucket Seats
Leather Seats	Power Driver Seat
Driver Adjustable Lumbar	Power Passenger Seat
Passenger Adjustable Lumbar	Heated Front Seat(s)
Heated Front Seat(s)	Cooled Front Seat(s)
Mirror Memory	Seat Memory
Heated Rear Seat(s)	Pass-Through Rear Seat
Floor Mats	Floor Mats
Leather Steering Wheel	Heated Steering Wheel
Steering Wheel Audio Controls	Adjustable Steering Wheel
Power Windows	Power Windows
Power Windows	Power Door Locks
Keyless Entry	Power Door Locks
Keyless Start	Remote Engine Start
Cruise Control	Security System
MP3 Capability	Auxiliary Audio Input
MP3 Capability	Auxiliary Audio Input
Power Outlet	Power Outlet
Climate Control	Multi-Zone A/C
A/C	Rear Defrost
Auto-Dimming Rearview Mirror	Traction Control
Stability Control	Daytime Running Lights
Driver Air Bag	Passenger Air Bag
Front Side Air Bag	Front Head Air Bag
Rear Head Air Bag	Passenger Air Bag Sensor
Telematics	Requires Subscription
Back-Up Camera	Back-Up Camera
Driver Restriction Features	Tire Pressure Monitor