Vehicle Details
Body Style
Truck
Engine
6.6L
Exterior Colour
Red
Transmission
Automatic
Drivetrain
4×4
Stock
303587
Fuel Type
Diesel
Trim Details
4WD Crew Cab Standard Box SLE
Description
The 2021 GMC Sierra 3500HD SLE 4WD Crew Cab Standard Box blends heavy-duty strength, professional-grade engineering, and everyday usability. Built for serious towing, hauling, and demanding jobsite performance, it delivers confidence with a refined interior and purposeful design; ideal for drivers who expect durability without compromise.
Performance & Capability
Engine: 6.6L Duramax V8 Turbo Diesel delivering immense torque and long-haul confidence
Transmission: Allison 10-speed automatic engineered for smooth, precise power delivery under heavy load
Drivetrain: Autotrac 4WD system with 2-speed transfer case for maximum traction in tough terrain and weather
Suspension: Heavy-duty suspension with Z71 Off-Road tuning for stability, control, and load-bearing strength
Axle Ratio: Optimized rear axle gearing designed for serious towing and hauling performance
Trailering Equipment: Integrated trailer brake controller, hitch guidance, and gooseneck/5th-wheel prep capability
Off-Road Readiness: X31 Off-Road Package with skid plates, hill descent control, and upgraded shocks for rugged terrain
Exhaust & Cooling: Exhaust brake, transmission oil cooler, and engine oil cooling system for sustained heavy-duty operation
High Capacity Systems: 220-amp alternator and high-capacity air filtration designed for demanding workloads
Winter & Weather Confidence
Heated Front Seats for added cold-weather comfort
Engine Block Heater for reliable cold starts in extreme temperatures
Heated, Power-Adjustable Tow Mirrors for visibility in snow, rain, and frost
Remote Start System to warm up the cabin before stepping inside
Heavy-Duty Defrost & Climate Systems designed for consistent cabin comfort in all seasons
Interior Comfort & Convenience
Front 40/20/40 Split-Bench Seating with durable materials and practical versatility
8-Way Power Driver Seat for personalized comfort on long drives
Rear 60/40 Folding Bench Seat for flexible cargo and passenger space
Dual-Zone Automatic Climate Control for balanced cabin temperature
Leather-Wrapped Steering Wheel with mounted audio and cruise controls
7-inch GMC Infotainment System with touchscreen access to media, settings, and connectivity
Apple CarPlay® & Android Auto™ compatibility for seamless smartphone integration
Multiple USB ports, 120V power outlets, and auxiliary charging options for work or travel
Remote Keyless Entry and Remote Start for convenience in daily operation
Deep-tinted glass and acoustic insulation for a quieter, more refined ride
Safety & Driver Assistance
GMC Pro Safety features including Forward Collision Alert and Lane Departure Warning
Rear Vision Camera for confident reversing and trailer maneuvering
Teen Driver Mode for monitored driving behavior and safety reinforcement
Tire Pressure Monitoring System for real-time tire health awareness
Hill Descent Control for added confidence on steep or uneven terrain
Auto-Locking Rear Differential for improved traction under load or off-road conditions
StabiliTrak Stability Control System for enhanced control in changing road conditions
Exterior Styling & Utility
Bold, professional-grade design with chrome bumpers and grille accents for a commanding presence
18-inch Machined Aluminum Wheels paired with all-terrain tires for durability and grip
LED Headlamps and Fog Lamps for improved nighttime visibility and modern styling
Durabed Steel Cargo Box designed for maximum strength and long-term wear resistance
Spray-On Bedliner for added protection against heavy cargo and jobsite abuse
Gooseneck/5th Wheel Prep Package with factory-installed mounting points and wiring
Trailer Wiring Provisions and Hitch Package for heavy-duty towing capability
CornerStep Rear Bumper and Front Recovery Hooks for practical jobsite functionality
Chrome accents and rugged X31 Off-Road styling cues for a bold, capable appearance
Whether tackling demanding jobsite duties, hauling heavy trailers, or navigating rugged terrain, the 2021 GMC Sierra 3500HD SLE delivers unmatched diesel strength, advanced towing capability, and dependable comfort. It’s a heavy-duty truck built for those who rely on power, durability, and professional-grade performance every day.
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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Requires Subscription
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Satellite Radio
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Audio system feature, 6-speaker system (Requires Crew Cab or Double Cab model.)
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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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Conventional Spare Tire
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Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door (Deleted with (ZW9) pickup bed delete.)
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Bumper, front chrome lower
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Bumper, rear chrome with bumper CornerSteps
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CornerStep, rear bumper
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Bed Step, Black integrated on forward portion of bed on driver and passenger side (Not available with (ZW9) pickup bed delete.)
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Mouldings, beltline, stainless steel
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Cargo tie downs (12), fixed, rated at 500 lbs (226.8 kg) per corner
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Grille, Chrome surround with high gloss Black mesh and Chrome inserts
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Daytime Running Lights
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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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Heated Mirrors
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Integrated Turn Signal Mirrors
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Power Mirror(s)
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Privacy Glass
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Door handles, body-colour
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Integrated Tailgate Step
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Tailgate and bed rail protection caps, top (Deleted with (ZW9) pickup bed delete.)
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Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light (Deleted with (ZW9) pickup bed delete.)
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Split Bench Seat
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WiFi Hotspot
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Cloth Seats
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Seat adjuster, driver 4-way manual
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Seat adjuster, passenger 4-way manual
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Pass-Through Rear Seat
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Rear Bench Seat
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Floor Mats
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Leather Steering Wheel
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Adjustable Steering Wheel
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Steering Wheel Audio Controls
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Instrument cluster, 6-gauge cluster featuring speedometer, fuel level, engine temperature, tachometer, voltage and oil pressure
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Driver Information Centre, 4.2" diagonal colour display includes driver personalization
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Exterior Temperature Display located in radio display
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Compass, located in instrument cluster
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Window, power front, drivers express up/down
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Power Windows
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Power Door Locks
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Keyless Entry
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Cruise Control
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Power Outlet
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Auxiliary Audio Input
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MP3 Player
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A/C
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Air vents, rear (Not available with Regular Cab model.)
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Mirror, inside rearview, manual tilt
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Assist handles, front A-pillar mounted for driver and passenger, rear B-pillar mounted
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8 Cylinder Engine
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Gasoline Fuel
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6-Speed A/T
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A/T
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Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)
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Running Boards/Side Steps
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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.)
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Air filter, heavy-duty
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Air filtration monitoring
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Transfer case, two-speed electronic shift with push button controls (Requires 4WD models.)
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Locking/Limited Slip Differential
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Four Wheel Drive
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Cooling, external engine oil cooler
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Cooling, auxiliary external transmission oil cooler
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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.)
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Alternator, 170 amps (Requires (L8T) 6.6L V8 gas engine.)
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Trailer brake controller, integrated
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Tow Hooks
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Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
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Suspension Package (Not available with (X31) Off-Road Package.)
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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 (Requires (L8T) 6.6L gas V8 engine. Not included with (ZW9) pickup bed delete.)
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Tow Hitch
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Trailering Information Label provides max trailer ratings for tongue weight, conventional, gooseneck and 5th wheel trailering (Not available with (ZW9) pickup bed delete.)
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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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Rear Seat Reminder (Requires Crew Cab or Double Cab model.)
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Driver Restriction Features
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Tire Pressure Monitor
No matches were found.
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Vehicle NameGMC Sierra 3500HD
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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 CodeMYD
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Trans Type6
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Trans Description Cont.Automatic
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First Gear Ratio (:1)4.03
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Second Gear Ratio (:1)2.36
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Third Gear Ratio (:1)1.53
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Fourth Gear Ratio (:1)1.15
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Fifth Gear Ratio (:1)0.85
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Sixth Gear Ratio (:1)0.67
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Reverse Ratio (:1)3.06
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Passenger Capacity6
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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)65.3
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Second Hip Room (in)60.24
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Gross Axle Wt Rating - Front (lbs)4800
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Gross Axle Wt Rating - Rear (lbs)7250
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Curb Weight - Front (lbs)3851
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Curb Weight - Rear (lbs)2915
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Gross Vehicle Weight Rating Cap (lbs)11350
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Gross Combined Wt Rating (lbs)24000
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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)14500
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Wt Distributing Hitch - Max Tongue Wt. (lbs)1450
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Fifth Wheel Hitch - Max Trailer Wt. (lbs)16530
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Fifth Wheel Hitch - Max Tongue Wt. (lbs)4132
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Maximum Trailering Capacity (lbs)20000
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Engine Order CodeL8T
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Engine TypeGas V8
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Displacement6.6L
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Fuel SystemDirect Injection
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SAE Net Horsepower @ RPM401 @ 5200
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SAE Net Torque @ RPM464 @ 4000
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Engine Oil CoolerYes
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Cold Cranking Amps @ 0° F (Primary)720
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Maximum Alternator Capacity (amps)170
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Frame TypeHydroformed
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Suspension Type - FrontShort/Long Arm w/Torsion Bars
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Suspension Type - Rear3-Stage Multi-Leaf
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Axle Type - FrontIndependent
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Axle Ratio (:1) - Front3.73
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Axle Ratio (:1) - Rear3.73
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Shock Absorber Diameter - Front (mm)51
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Shock Absorber Diameter - Rear (mm)51
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Stabilizer Bar Diameter - Front (in)1.38
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Front Tire Order CodeQF6
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Rear Tire Order CodeQF6
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Spare Tire Order CodeZYG
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Front Tire SizeLT275/70R18
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Rear Tire SizeLT275/70R18
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Spare Tire SizeLT275/70R18
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Front Tire Capacity (lbs)3020
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Rear Tire Capacity (lbs)3638
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Spare Tire Capacity (lbs)3638
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Front Wheel Size (in)18 x 8
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Rear Wheel Size (in)18 x 8
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Spare Wheel Size (in)18 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 TypePwr Recirculating Ball
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Steering Ratio (:1), At LockN/A
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Turning Diameter - Curb to Curb (ft)52.7
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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)14 x 1.6
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Rear Brake Rotor Diam x Thickness (in)14.1 x 1.3
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Fuel Tank Capacity, Approx (L)136
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Wheelbase (in)158.94
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Length, Overall (in)250.08
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Width, Max w/o mirrors (in)81.85
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Height, Overall (in)80.87
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Cab to Axle (in)42.1
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Ground Clearance, Front (in)11.18
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Ground Clearance, Rear (in)11.18
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Cargo Box Length @ Floor (in)82.2
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Cargo Box Width @ Floor (in)71.4
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Cargo Box Width @ Wheelhousings (in)51.85
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Cargo Box (Area) Height (in)21
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Cargo Volume (ft³)69.5
No matches were found.
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