2021 GMC Sierra 3500HD 4WD Crew Cab 159" AT4

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

Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)

GVWR, 11,350 lbs. (5148 kg) with single rear wheels (Included and only available with TK30743 model and (L8T) 6.6L V8 gas engine. Requires single rear wheels.)

Air filter, heavy-duty

Air filtration monitoring

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

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

Recovery hooks, Red

Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section

Skid Plates protect the oil pan, front axle and transfer case

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.)

Tire, spare LT275/70R18 all-terrain, blackwall

Single Rear Wheels

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 Step, Black integrated on forward portion of bed on driver and passenger side

Moldings, beltline, Black

Wheelhouse liners, rear

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).)

Cargo tie downs (12), fixed, rated at 500 lbs per corner

Grille, Painted Black surround with high gloss Black mesh and Black chrome inserts

Fog lamps, LED

Taillamps, LED signature taillight with LED stop and reverse light

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

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])

Mirror caps, high gloss Black

Glass, deep-tinted

Door handles, body-color

Tailgate, GMC MultiPro Tailgate with six functional load/access features

Tailgate and bed rail protection caps, top

Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light

HD Radio

Audio system feature, 6-speaker system

4G LTE Wi-Fi Hotspot capable (Terms and limitations apply. See onstar.com or dealer for details.)

Seat adjuster, driver 10-way power including lumbar

Seat adjuster, passenger 10-way power including lumbar

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 underseat storage, (includes child seat top tether anchor)

Seats, heated second row outboard seats

Driver memory, recalls driver "presets" for power driver seat and outside mirrors

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 column, manual Tilt-Wheel and telescoping

Steering wheel audio controls

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

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.)

Exterior Temperature Display located in radio display

Compass, located in instrument cluster

Window, power front, drivers express up/down

Remote vehicle starter system

Cruise control, steering wheel-mounted

Theft-deterrent system, unauthorized entry

Steering column, lock control, electrical

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.)

StabiliTrak, stability control system with Proactive Roll Avoidance and traction control includes electronic trailer sway control and hill start assist

Hill Descent Control

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

Rear Seat Reminder

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