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2020 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 2020 GMC Sierra 3500?

  • The Sierra 3500 is available in a new trim called the AT4.
  • Sierra 3500 trims have been upgraded with Rear Seat Heaters, Blind Spot Monitor, Smart Key, and 20 Inch Plus Wheels as standard equipment this year.
  • The Denali trim now comes with Dual Rear Wheels as standard equipment.
  • The SLE trim now comes with Dual Rear Wheels as standard equipment.
  • The SLT trim now comes with Heated Steering Wheel and Dual Rear Wheels as standard equipment.

2020 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:

  • 6.6L
  • 401-hp, 464-lb-ft of torque 6.6L
  • 445-hp, 910-lb-ft of torque 6.6L
  • Traction Control
  • Vinyl Seats
  • Automatic Transmission
  • Bluetooth Technology
  • Apple CarPlay
  • Android Auto
  • 4WD/AWD
  • Side Airbags
  • View our GMC Sierra 3500 inventory

SLE:

SLT:

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

AT4:

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

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 2WD 2D Regular Cab

Standard Features

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

Optional Features

  • Air Conditioning
  • Alloy Wheels
  • Auxiliary Audio Input
  • Bed Cover
  • Bed Liner
  • Blind Spot Monitor
  • BOSE Sound System
  • Cloth Seats
  • Dual Rear Wheels
  • Fifth Wheel Tow Hitch
  • Front Seat Heaters
  • Gooseneck Tow Hitch
  • Heated Mirrors
  • Heated Steering Wheel
  • Lane Departure Warning
  • Long Bed
  • Navigation System
  • Parking Sensors
  • Power Mirrors
  • Power Seat(s)
  • Rear Defroster
  • Rear View Camera
  • Remote Start
  • Running Boards
  • Satellite Radio Ready
  • Smart Key
  • 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

2020 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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