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2021 GMC Sierra 3500 review

Research, photos, specs, and expertise

GMC Sierra 3500 highlights

Customer rating

RepairPal reliability rating

Mileage (EPA estimate)

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Pricing for current inventory

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All GMC Sierra 3500 years

What is new for the 2021 GMC Sierra 3500?

  • Sierra 3500 trims have been upgraded with Flex Fuel Vehicle as standard equipment this year.
  • Head Up Display, Automated Cruise Control, Rear Air Conditioning, and Kicker Speaker System features are now available as options on select trims.
  • The AT4 trim now comes with BOSE Sound System as standard equipment.
  • The SLE trim now comes with Satellite Radio Ready as standard equipment.
  • The Base trim now comes with Cruise Control, Bed Liner, Cloth Seats, and Power Mirrors as standard equipment.
  • The SLT trim now comes with Rear View Camera as standard equipment.

2021 GMC Sierra 3500 trims

Curious how GMC Sierra 3500 trims differ? Use our side-by-side vehicle comparison to see the differences and similarities

Base:

  • 401-hp, 464-lb-ft of torque 6.6L
  • 445-hp, 910-lb-ft of torque 6.6L
  • Vinyl Seats
  • Traction Control
  • Cruise Control
  • Side Airbags
  • Overhead Airbags
  • Rear View Camera
  • Tow Hitch
  • Bed Liner
  • View our GMC Sierra 3500 inventory

SLE:

SLT:

  • Includes all features available on the SLE
  • Rear Defroster
  • Power Seats
  • Memory Seats
  • Front Seat Heaters
  • Heated Steering Wheel
  • Smart Key
  • Remote Start
  • Leather Seats
  • View our GMC Sierra 3500 SLT inventory

AT4:

  • Includes all features available on the SLT
  • Rear Seat Heaters
  • A/C Seats
  • Lane Departure Warning

Denali:

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Ratings & reliability

Customer ratings

5 out of 5

1 customer reviews

RepairPal reliability rating

3
Average

RepairPal gave the GMC Sierra 3500 an overall reliability rating of 3 out of 5 stars, which RepairPal describes as Average. This rating ranks GMC Sierra 3500 14th out of 19 among Fullsize Trucks.

View RepairPal's full rating of the GMC Sierra 3500

GMC Sierra 3500 features and specs

Curious how GMC Sierra 3500 trims differ? Use our side-by-side vehicle comparison to see the differences and similarities

Base 2WD 2D Regular Cab

Standard Features

  • ABS Brakes
  • Air Conditioning
  • AM/FM Stereo
  • Android Auto
  • Apple CarPlay
  • Automatic Transmission
  • Auxiliary Audio Input
  • Bed Liner
  • Bluetooth Technology
  • Cruise Control
  • Dual Rear Wheels
  • Long Bed
  • Overhead Airbags
  • Rear View Camera
  • Side Airbags
  • Tow Hitch
  • Traction Control
  • Vinyl Seats

Optional Features

  • A/C Seat(s)
  • Android Auto
  • Apple CarPlay
  • Automated Cruise Control
  • Auxiliary Audio Input
  • Bed Liner
  • Blind Spot Monitor
  • Cloth Seats
  • Dual Rear Wheels
  • Fifth Wheel Tow Hitch
  • Flex Fuel Vehicle
  • Front Seat Heaters
  • Gooseneck Tow Hitch
  • Lane Departure Warning
  • Navigation System
  • Parking Sensors
  • Power Locks
  • Power Mirrors
  • Power Seat(s)
  • Power Windows
  • Rear Defroster
  • Rear View Camera
  • Remote Start
  • Running Boards
  • Satellite Radio Ready
  • Tow Hitch

Drive Wheels

Rear Wheel Drive (2WD)

Engine size

6.6L

Horsepower

401

Torque (ft-lbs)

464

Engine type

Gas

Fuel capacity

36

Wheelbase

141.55"

Overall length

235.5"

Width

81.75"

Height

80.94"

Leg room

F 44.53"

Head room

F 43.11"

Front tires

LT275/70R18

Rear tires

LT275/70R18

Seating capacity

3

Max towing capacity

1450/20000 lbs.

Transmission

Automatic

2021 GMC Sierra 3500 FAQ

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Statements of fuel economy or EV range are based on EPA and other third-party estimates for vehicles when new. Fuel economy and EV range will degrade with time and vary based on age, driving conditions, vehicle history, and other conditions. See fueleconomy.gov for more info.

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