Vehicle Details
Body Style
Truck
Engine
5.3L
Exterior Colour
Black
Transmission
Automatic
Drivetrain
4×4
Stock
303829
Fuel Type
Gasoline
Trim Details
Crew Cab Short Box 4-Wheel Drive AT4
Description
The 2021 GMC Sierra 1500 AT4 Crew Cab blends rugged off-road capability, premium comfort, and professional-grade performance into one bold and versatile pickup. Purpose-built for adventure while refined enough for everyday driving, the AT4 stands out with its lifted stance, aggressive styling, and advanced technology—ready for work, play, and everything in between.
Performance & Capability
Engine: 5.3L ECOTEC3 V8 delivering impressive horsepower, strong towing capability, and Dynamic Fuel Management efficiency
Transmission: Smooth and responsive 10-speed automatic transmission for optimized power delivery
Drivetrain: Autotrac® Two-Speed 4-Wheel Drive system for confident traction on varying terrain
Off-Road Suspension: Factory AT4 off-road suspension with a 2-inch lift for enhanced ground clearance
Rear Differential: Automatic locking rear differential for increased traction in challenging conditions
Hill Descent Control helps maintain confidence on steep grades and uneven trails
Skid Plates provide added protection when venturing off the beaten path
High-Capacity Air Cleaner, Engine Oil Cooler, and Heavy-Duty Transmission Cooler support demanding workloads
FlexRide Drive Mode System allows customization of vehicle performance based on road and terrain conditions
Trailering Package equipped for towing confidence and versatility
Trailering & Utility
Integrated Trailer Brake Controller for smoother, more controlled towing
Advanced Trailering System with built-in towing assistance features
Hitch Guidance with Hitch View simplifies trailer connections and maneuvering
Rear Vision Camera assists when backing up or aligning a trailer
Spray-On Bedliner helps protect the cargo box from wear and damage
GMC MultiPro Tailgate offers multiple configurations for loading, unloading, and cargo access
Bed-Mounted 120V Power Outlet provides convenient power at the jobsite or campsite
LED Cargo Box Lighting improves visibility when loading gear after dark
Rear Wheelhouse Liners add durability and protection inside the bed
Winter & Weather Comfort
Heated and Ventilated Front Seats for year-round comfort
Heated Rear Outboard Seats keep passengers comfortable in colder temperatures
Heated Leather-Wrapped Steering Wheel for added warmth on winter mornings
Remote Vehicle Start allows the cabin to be pre-heated or cooled before departure
Tri-Zone Automatic Climate Control ensures personalized comfort throughout the cabin
Rear Window Defroster improves visibility during harsh weather conditions
Engine Block Heater provides reliable cold-weather starting performance
Interior Comfort & Convenience
Premium Front Bucket Seats with 8-Way Power Driver and Passenger Adjustments
Driver Memory Settings for preferred seat and mirror positions
Spacious Crew Cab configuration with generous rear passenger room
Rear Seat Storage Package provides additional secure storage solutions
Power Sliding Rear Window enhances ventilation and convenience
Full-Length Center Console with ample storage and organization
Keyless Open and Push-Button Start for effortless entry and ignition
Premium All-Weather Floor Liners help protect the interior year-round
Auto-Dimming Rearview Mirror reduces glare during nighttime driving
Universal Home Remote for convenient garage and gate access
Technology & Connectivity
GMC Premium Infotainment System with Navigation
8-Inch Touchscreen Display with intuitive controls and smartphone connectivity
Wireless Charging Pad for compatible devices
Bose® Premium Audio System delivering rich, immersive sound quality
Bluetooth® Hands-Free Calling and Audio Streaming
Multiple USB Ports throughout the cabin for charging and connectivity
SiriusXM® Satellite Radio and HD Radio capability for expanded entertainment options
4G LTE Wi-Fi® Hotspot Capability keeps passengers connected on the go
Steering Wheel-Mounted Audio and Cruise Controls for added convenience
Driver Information Centre provides important vehicle data at a glance
Safety & Driver Assistance
HD Rear Vision Camera for improved visibility when reversing
Tire Pressure Monitoring System with real-time tire information
Comprehensive Airbag System for enhanced occupant protection
Teen Driver Technology encourages safer driving habits and monitoring features
Rear Seat Reminder helps ensure important items are not left behind
Advanced braking systems provide dependable stopping performance both on and off-road
Exterior Styling & Utility
Exterior Colour: Dark Sky Metallic — a bold and sophisticated finish with rugged appeal
Signature AT4 Styling with aggressive off-road-inspired design elements
20-Inch Machined Aluminum Wheels wrapped in Goodyear Wrangler Territory All-Terrain Tires
Distinctive Red Front Recovery Hooks showcase the truck's off-road readiness
LED Front Fog Lamps improve visibility in challenging conditions
Body-Colour Front and Rear Bumpers create a premium, integrated appearance
Deep-Tinted Rear Glass enhances privacy and comfort
Power Sunroof adds an open-air driving experience
Premium Exhaust Tips provide a refined finishing touch
CornerStep Rear Bumper allows easier access to the truck bed
Whether you're towing a trailer, exploring remote trails, tackling demanding jobs, or cruising through the city, the 2021 GMC Sierra 1500 AT4 delivers powerful performance, premium comfort, and authentic off-road capability. It's the perfect combination of strength, technology, and adventure-ready confidence for drivers who demand more from their truck.
Packages & Options
Standard Equipment
Technical Specifications
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AM/FM Stereo
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Auxiliary Audio Input
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Bluetooth Connection
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MP3 Player
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Smart Device Integration
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HD Radio
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Requires Subscription
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Satellite Radio
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Audio system feature, 6-speaker system
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Steering Wheel Audio Controls
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WiFi Hotspot
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Aluminum Wheels
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Tires - Front All-Terrain
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Tires - Rear All-Terrain
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Tires - Front All-Season
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Tires - Rear All-Season
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Wheel, 17" x 8" (43.2 cm x 20.3 cm) full-size, steel spare
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Wheelhouse liners, rear
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Bumper, front, body-colour lower (Front bumper colour will be high gloss black.)
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Bumper, rear body-colour with corner steps
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CornerStep, rear bumper
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Grille (Body-colour surround with high gloss Black mesh and Black chrome inserts. With (PCP) AT4 CarbonPro Edition the grille will have a unique grille surround with Black Chrome finish.)
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Daytime Running Lights
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Fog Lamps
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Taillamps, LED signature taillight with LED stop and reverse light
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Lamps, cargo area, cab mounted integrated with centre high mount stop lamp, with switch in bank on left side of steering wheel
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LED Cargo Area Lighting located in cargo box activated with switch on centre switch bank or key fob
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Heated Mirrors
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Mirror Memory
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Power Folding Mirrors
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Power Mirror(s)
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Privacy Glass
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Integrated Tailgate Step
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Tailgate, gate function manual with EZ Lift, includes power lock and release includes hitch area light
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Tailgate and bed rail protection caps, top
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Door handles, body-colour
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Bed Liner
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Cargo tie downs (12), fixed rated at 500 lbs (226.8 kg) per corner
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Bucket Seats
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Leather Seats
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Driver Adjustable Lumbar
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Power Driver Seat
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Passenger Adjustable Lumbar
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Power Passenger Seat
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Heated Front Seat(s)
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Cooled Front Seat(s)
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Rear Bench Seat
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Centre console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability
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Floor covering, colour-keyed carpeting
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Floor Mats
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Adjustable Steering Wheel
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Steering column, lock control, electrical
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Leather Steering Wheel
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Heated Steering Wheel
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Instrument cluster 6-gauge cluster featuring speedometer, fuel level, engine temperature, tachometer, voltage and oil pressure
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Compass, located in instrument cluster
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Driver Information Centre, 4.2" diagonal colour display includes driver personalization
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In-vehicle Trailering App includes checklist, trailer maintenance reminders, trailer security alerts, trailer mileage, tow/haul reminder and trailer electrical diagnostics
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Power Windows
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Power Door Locks
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Keyless Entry
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Keyless Start
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Remote Engine Start
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Cruise Control
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Mirror Memory
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Seat Memory
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Security System
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Auxiliary Audio Input
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MP3 Player
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Power Outlet
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Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
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USB ports, dual, charge-only (2nd row)
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Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
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A/C
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Climate Control
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Multi-Zone A/C
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Rear Defrost
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Auto-Dimming Rearview Mirror
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Assist handles, front A-pillar mounted for driver and passenger, rear B-pillar mounted
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GMC Connected Access capable (Subject to terms. See onstar.ca or dealer for details.)
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8 Cylinder Engine
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Gasoline Fuel
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10-Speed A/T
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A/T
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Pickup bed
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GVWR, 7000 lbs. (3175 kg) (Requires Crew Cab model with (L84) 5.3L EcoTec3 V8 engine or (L87) 6.2L EcoTec3 V8 engine.)
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Air filter, heavy-duty
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Automatic Stop/Start (Standard on vehicles built before 6-7-2021. Most vehicles built on or after 6-7-2021 that are equipped with a V8 engine and (MQB) 10-speed automatic transmission will have (NSS) Not Equipped with Automatic Stop/Start, which removes Automatic Stop/Start and its content. See dealer for details.)
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Hill Descent Control
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Locking/Limited Slip Differential
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Transfer case, two-speed, electronic Autotrac with push button control (4WD models only)
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Suspension, Off-Road with 2" factory installed lift and monotube shocks
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Four Wheel Drive
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Cooling, external engine oil cooler (Not available with (LM2) Duramax 3.0L Turbo-Diesel I6 engine.)
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Cooling, auxiliary external transmission oil cooler (Not available with (LM2) Duramax 3.0L Turbo-Diesel I6 engine.)
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Alternator, 170 amps (Included and only available with (L84) 5.3L EcoTec3 V8 engine or (L87) 6.2L EcoTec3 V8 engine. Not available with (LM2) Duramax 3.0L Turbo-Diesel I6 engine.)
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Battery, heavy-duty 730 cold-cranking amps/80 Amp-hr maintenance-free with rundown protection and retained accessory power (Included and only available with (L84) 5.3L EcoTec3 V8 engine, (L3B) 2.7L Turbo engine and (L87) 6.2L EcoTec3 V8 engine.)
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Frame, fully-boxed, hydroformed front section
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Skid Plates
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Trailer brake controller, integrated
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Tow Hooks
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Power Steering
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4-Wheel Disc Brakes
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ABS
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Brake lining wear indicator
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Capless Fuel Fill
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Exhaust, aluminized stainless-steel muffler and tailpipe
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Exhaust, dual with premium tips (With (PCP) AT4 CarbonPro Edition the exhaust tips will be black.)
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Tow Hitch
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ProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (U1D) In-vehicle Trailering App
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Stability Control
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Traction Control
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Daytime Running Lights
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Driver Air Bag
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Front Head Air Bag
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Front Side Air Bag
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Passenger Air Bag
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Passenger Air Bag Sensor
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Rear Head Air Bag
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Requires Subscription
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Telematics
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Back-Up Camera
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Hitch Guidance
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Driver Restriction Features
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Tire Pressure Monitor
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Rear Seat Reminder
No matches were found.
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Vehicle NameGMC Sierra 1500
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Body StyleCrew Cab Pickup
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Body CodeE63
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DrivetrainFour Wheel Drive
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Trans Order CodeMQB
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Trans Type10
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Trans Description Cont.Automatic
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First Gear Ratio (:1)4.69
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Second Gear Ratio (:1)2.98
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Third Gear Ratio (:1)2.15
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Fourth Gear Ratio (:1)1.8
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Fifth Gear Ratio (:1)1.52
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Sixth Gear Ratio (:1)1.28
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Seventh Gear Ratio (:1)1.00
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Eighth Gear Ratio (:1)0.85
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Ninth Gear Ratio (:1)0.69
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Tenth Gear Ratio (:1)0.63
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Reverse Ratio (:1)4.86
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Transfer Case ModelMagna MP3023/4
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Transfer Case Gear Ratio (:1), High1.00
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Transfer Case Gear Ratio (:1), Low2.69
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Passenger Capacity5
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Front Head Room (in)43.03
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Front Leg Room (in)44.53
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Front Shoulder Room (in)66.02
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Front Hip Room (in)61.18
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Second Head Room (in)40.12
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Second Leg Room (in)43.4
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Second Shoulder Room (in)65.16
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Second Hip Room (in)60.24
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Gross Axle Wt Rating - Front (lbs)3800
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Gross Axle Wt Rating - Rear (lbs)3800
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Curb Weight - Front (lbs)2839
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Curb Weight - Rear (lbs)1976
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Gross Vehicle Weight Rating Cap (lbs)7000
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Gross Combined Wt Rating (lbs)15000
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EnerGuide Estimate - City (L/100 km)14.7
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EnerGuide Estimate - Hwy (L/100 km)11.2
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G/km Of CO2 Emissions307
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Dead Weight Hitch - Max Trailer Wt. (lbs)5000
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Dead Weight Hitch - Max Tongue Wt. (lbs)500
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Wt Distributing Hitch - Max Trailer Wt. (lbs)9200
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Wt Distributing Hitch - Max Tongue Wt. (lbs)920
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Fifth Wheel Hitch - Max Trailer Wt. (lbs)7500
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Fifth Wheel Hitch - Max Tongue Wt. (lbs)1875
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Maximum Trailering Capacity (lbs)9200
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Engine TypeGas V8
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Fuel SystemDirect Injection
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Engine Order CodeL84
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Displacement5.3L/325
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SAE Net Horsepower @ RPM355 @ 5600
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SAE Net Torque @ RPM383 @ 4100
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Engine Oil CoolerYes
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Cold Cranking Amps @ 0° F (Primary)730
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Maximum Alternator Capacity (amps)170
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Frame TypeBox Ladder
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Suspension Type - FrontIndependent
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Suspension Type - RearSolid Axle
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Spring Capacity - Front (lbs)3800
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Spring Capacity - Rear (lbs)3850
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Axle Capacity - Front (lbs)3800
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Axle Capacity - Rear (lbs)3800
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Axle Ratio (:1) - Front3.23
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Axle Ratio (:1) - Rear3.23
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Shock Absorber Diameter - Front (mm)50
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Shock Absorber Diameter - Rear (mm)51
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Stabilizer Bar Diameter - Front (in)1.3
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Front Tire Order CodeXCK
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Rear Tire Order CodeXCK
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Spare Tire Order CodeXCQ
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Front Tire Size265/65R18SL
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Rear Tire Size265/65R18SL
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Spare Tire Size265/70R17SL
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Revolutions/Mile @ 45 mph - Front (Rev/Mile)N/A
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Revolutions/Mile @ 45 mph - Rear (Rev/Mile)N/A
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Revolutions/Mile @ 45 mph - Spare (Rev/Mile)N/A
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Front Wheel Size (in)18 x 8.5
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Rear Wheel Size (in)18 x 8.5
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Spare Wheel Size (in)17 x 8
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Front Wheel MaterialAluminum
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Rear Wheel MaterialAluminum
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Spare Wheel MaterialSteel
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Steering TypeElectric Rack & Pinion
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Turning Diameter - Curb to Curb (ft)46.3
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Turning Diameter - Wall to Wall (ft)N/A
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Brake TypePwr
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Brake ABS System4-Wheel
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Disc - FrontYes
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Disc - RearYes
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Front Brake Rotor Diam x Thickness (in)13.5 x 1.18
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Rear Brake Rotor Diam x Thickness (in)13.6 x 0.79
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Fuel Tank Capacity, Approx (L)91
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Wheelbase (in)147.53
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Length, Overall (in)231.72
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Width, Max w/o mirrors (in)81.24
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Height, Overall (in)78.35
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Ground Clearance, Front (in)10.88
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Ground Clearance, Rear (in)10.88
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Cargo Box Length @ Floor (in)69.92
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Cargo Box Width @ Floor (in)71.4
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Cargo Box Width @ Wheelhousings (in)50.63
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Cargo Box (Area) Height (in)22.4
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Tailgate Width (in)71.4
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Cargo Volume (ft³)62.9
No matches were found.
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* Every reasonable effort is made to ensure the accuracy of the information listed above. Vehicle pricing, incentives, options (including standard equipment), and technical specifications listed is for the 2021 GMC Sierra 1500 AT4 may not match the exact vehicle displayed. Please confirm the accuracy of this information with a sales representative.