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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)

(data not available)

Pricing for current inventory

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All GMC Sierra 3500 years

What is new for the 2021 GMC Sierra 3500?

  • Enhanced fuel efficiency with new engine technology
  • Updated infotainment system with larger touchscreen and improved connectivity
  • Additional safety features including automatic emergency braking and lane-keeping assist
  • New exterior color options available for a refreshed look
  • Optional all-wheel drive now offered on select trims

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:

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

SLE 2D Regular Cab 2WD

Standard Features

  • Power Locks
  • ABS Brakes
  • Cloth Seats
  • Air Conditioning
  • Power Mirrors
  • Rear View Camera
  • Side Airbags
  • Overhead Airbags
  • Traction Control
  • Cruise Control
  • Power Windows
  • Heated Mirrors
  • Dual Rear Wheels
  • Long Bed
  • Alloy Wheels
  • Tow Hitch
  • Automatic Transmission
  • AM/FM Stereo
  • Auxiliary Audio Input
  • Apple CarPlay
  • Bluetooth Technology
  • Android Auto
  • Satellite Radio Ready

Optional Features

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

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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