2021 GMC Sierra 3500HD Specs & Features

Starting MSRP

Engine TypeGas
Transmission6-speed shiftable automatic
Drive TypeFour wheel drive
Total Seating6
Basic Warranty3 yr./ 36,000 mi.
automatic locking hubsyes
electronic hi-lo gear selectionyes
part time 4WDyes
Drive typeFour wheel drive
Rear locking differentialyes
Transmission6-speed shiftable automatic
Fuel & MPG
Fuel & MPG
Fuel tank capacity36.0 gal.
Fuel typeRegular unleaded
Range in miles (cty/hwy)0/0 mi.
direct injectionyes
Base engine size6.6 l
Base engine typeGas
Cam typeOverhead valves (ohv)
Horsepower401 hp @ 5,200 rpm
Torque464 lb-ft @ 4,000 rpm
Turning circle52.7 ft.
Valve timingVariable
Towing & Hauling
Towing & Hauling
Max Towing Capacity20,000 lbs.
Max Payload Capacity4,398 lbs.
2 front headrestsyes
3 rear headrestsyes
LED headlampyes
auto delay off headlampsyes
child seat anchorsyes
daytime running lightsyes
dual front side-mounted airbagsyes
dusk sensing headlampsyes
engine immobilizeryes
front and rear head airbagsyes
stability controlyes
tire pressure monitoringyes
traction controlyes
4-wheel ABSyes
Front and rear ventilated disc brakesyes
Front center 3-point beltyes
Passenger airbag occupant sensing deactivationyes
Rear center 3-point beltyes
Rear door child safety locksyes
Rear height adjustable headrestsyes
Snow Plow Prep/Camper Package +$300
Convenience Package +$1,310
Convenience Package w/Pickup Bed Delete +$1,310
X31 Off-Road Package +$525
In-Car Entertainment
In-Car Entertainment
6 total speakersyes
USB connectionyes
USB with external media controlyes
speed sensitive volume controlyes
AM/FM stereoyes
Comfort & Convenience
Comfort & Convenience
front and rear cupholdersyes
front door pocketsyes
power steeringyes
rear view camerayes
tilt-adjustable steering wheelyes
Single zone front air conditioningyes
Power Feature
Power Feature
4 one-touch power windowsyes
power door locksyes
Heated mirrorsyes
Interior Options
Interior Options
SiriusXM Radio +$100
Upfitter Switch Kit +$150
All-Weather Floor Liner +$210
Cruise Control +$225
Color-Keyed Carpet Floor Covering +$100
120-Volt Instrument Panel Power Outlet +$225
OnStar and GMC Connected Services Capable +$175
external temperature displayyes
trip computeryes
Front Seat Dimensions
Front Seat Dimensions
4 -way manual driver seat adjustmentsyes
4 -way manual passenger seat adjustmentyes
40-20-40 split bench front seatsyes
Front head room43.0 in.
Front hip room61.2 in.
Front leg room44.5 in.
Front shoulder room66.0 in.
Rear Seat Dimensions
Rear Seat Dimensions
folding center armrestyes
rear ventilation ductsyes
Rear head room40.1 in.
Rear hip Room60.2 in.
Rear leg room43.4 in.
Rear shoulder room65.3 in.
Split-folding rear seatbackyes
Exterior Options
Exterior Options
GMC MultiPro Tailgate +$445
Black Assist Step +$450
GMC MultiPro Tailgate Step Lights +$200
18" Machined Aluminum Wheels w/Dark Grey Metallic Accents +$300
Deep-Tinted Glass +$200
Bed View Camera +$250
LT275/70R18 All-Terrain Blackwall Spare Tire +$380
Spray-On Bed Liner +$545
6" Rectangular Black Tubular Assist Steps +$775
LED Cargo Area Lighting +$125
4" Round Black Tubular Assist Steps +$775
Front License Plate Kityes
Outside Heated Power-Adjustable Mirrors +$50
Smoked Amber LED Roof Marker Lamps +$55
Outside Vertical Trailering Mirrors +$720
Black Front and Rear Molded Splash Guards +$190
Pickup Bed Delete +-$1,155
Cargo Tie-Down Rings +$105
Electric Rear-Window Defogger +$225
Bed Length98.3 in.
Curb weight7,064 lbs.
Gross weight11,500 lbs.
Ground clearance11.2 in.
Height80.9 in.
Length266.1 in.
Maximum payload4,398 lbs.
Maximum towing capacity20,000 lbs.
Overall Width without Mirrors81.9 in.
Wheel base172.0 in.
Exterior Colors
  • Onyx Black
  • Quicksilver Metallic
  • Cardinal Red
  • Pacific Blue Metallic
  • Summit White
  • Brownstone Metallic
Interior Colors
  • Jet Black, vinyl
  • Jet Black, cloth
Tires & Wheels
Tires & Wheels
fullsize matching spare tireyes
painted steel wheelsyes
underbody mounted spare tireyes
18 in. wheelsyes
All terrain tiresyes
LT275/70R18 tiresyes
front independent suspensionyes
Stabilizer bar stabilizer baryes
Basic3 yr./ 36,000 mi.
Drivetrain5 yr./ 60,000 mi.
Free Maintenance1 yr./ unlimited mi.
Roadside5 yr./ 60,000 mi.
Rust6 yr./ 100,000 mi.