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. Â
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Performance & CapabilityÂ
Engine: 6.6L Duramax V8 Turbo Diesel delivering immense torque and long-haul confidence Â
Transmission: Allison 10-speed automatic engineered for smooth, precise power delivery under heavy load Â
Drivetrain: Autotrac 4WD system with 2-speed transfer case for maximum traction in tough terrain and weather Â
Suspension: Heavy-duty suspension with Z71 Off-Road tuning for stability, control, and load-bearing strength Â
Axle Ratio: Optimized rear axle gearing designed for serious towing and hauling performance Â
Trailering Equipment: Integrated trailer brake controller, hitch guidance, and gooseneck/5th-wheel prep capability Â
Off-Road Readiness: X31 Off-Road Package with skid plates, hill descent control, and upgraded shocks for rugged terrain Â
Exhaust & Cooling: Exhaust brake, transmission oil cooler, and engine oil cooling system for sustained heavy-duty operation Â
High Capacity Systems: 220-amp alternator and high-capacity air filtration designed for demanding workloads Â
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Winter & Weather ConfidenceÂ
Heated Front Seats for added cold-weather comfort Â
Engine Block Heater for reliable cold starts in extreme temperatures Â
Heated, Power-Adjustable Tow Mirrors for visibility in snow, rain, and frost Â
Remote Start System to warm up the cabin before stepping inside Â
Heavy-Duty Defrost & Climate Systems designed for consistent cabin comfort in all seasons Â
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Interior Comfort & ConvenienceÂ
Front 40/20/40 Split-Bench Seating with durable materials and practical versatility Â
8-Way Power Driver Seat for personalized comfort on long drives Â
Rear 60/40 Folding Bench Seat for flexible cargo and passenger space Â
Dual-Zone Automatic Climate Control for balanced cabin temperature Â
Leather-Wrapped Steering Wheel with mounted audio and cruise controls Â
7-inch GMC Infotainment System with touchscreen access to media, settings, and connectivity Â
Apple CarPlay® & Android Autoâ„¢ compatibility for seamless smartphone integration Â
Multiple USB ports, 120V power outlets, and auxiliary charging options for work or travel Â
Remote Keyless Entry and Remote Start for convenience in daily operation Â
Deep-tinted glass and acoustic insulation for a quieter, more refined ride Â
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Safety & Driver AssistanceÂ
GMC Pro Safety features including Forward Collision Alert and Lane Departure Warning Â
Rear Vision Camera for confident reversing and trailer maneuvering Â
Teen Driver Mode for monitored driving behavior and safety reinforcement Â
Tire Pressure Monitoring System for real-time tire health awareness Â
Hill Descent Control for added confidence on steep or uneven terrain Â
Auto-Locking Rear Differential for improved traction under load or off-road conditions Â
StabiliTrak Stability Control System for enhanced control in changing road conditions Â
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Exterior Styling & UtilityÂ
Bold, professional-grade design with chrome bumpers and grille accents for a commanding presence Â
18-inch Machined Aluminum Wheels paired with all-terrain tires for durability and grip Â
LED Headlamps and Fog Lamps for improved nighttime visibility and modern stylingÂ
Durabed Steel Cargo Box designed for maximum strength and long-term wear resistance Â
Spray-On Bedliner for added protection against heavy cargo and jobsite abuse Â
Gooseneck/5th Wheel Prep Package with factory-installed mounting points and wiring Â
Trailer Wiring Provisions and Hitch Package for heavy-duty towing capability Â
CornerStep Rear Bumper and Front Recovery Hooks for practical jobsite functionality Â
Chrome accents and rugged X31 Off-Road styling cues for a bold, capable appearance Â
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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.Â
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Sle Preferred Equipment Group • 3SAincludes standard equipment
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Air Conditioning
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Backup Camera
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Bluetooth Connection
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Cruise Control
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Keyless Entry
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Power Windows
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Running Boards
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Satellite Radio
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Smart Device Integration
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Wi-Fi Hotspot
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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
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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
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Body StyleTruck
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Engine5.3L
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Exterior ColourBlack
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TransmissionAutomatic
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Drivetrain4×4
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Stock303058
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Fuel TypeGasoline
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65,713 km
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AMVIC Fee+$10
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Doc Fee+$499
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AMVIC Fee+$10
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Doc Fee+$499