2021 GMC Sierra 3500 review
GMC Sierra 3500 highlights
Customer rating
(not yet rated)
Mileage (EPA estimate)
(data not available)
Pricing for current inventory
(no current inventory)
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
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:
- Includes all features available on the Base
- Satellite Radio Ready
- Alloy Wheels
- View our GMC Sierra 3500 SLE inventory
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
- View our GMC Sierra 3500 AT4 inventory
Denali:
- Includes all features available on the AT4
- Parking Sensors
- Blind Spot Monitor
- Running Boards
- 20 Inch Plus Wheels
- BOSE Sound System
- Navigation System
- View our GMC Sierra 3500 Denali inventory
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Ratings & reliability
Customer ratings
The 2021 GMC Sierra 3500 is not yet rated. Help future customers learn about a car you've owned and write a review.
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 3500GMC Sierra 3500 features and specs
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
- Long Bed
- Overhead Airbags
- Power Locks
- Power Mirrors
- Power Windows
- Rear View Camera
- Satellite Radio Ready
- Side Airbags
- Tow Hitch
- Traction Control
- A/C Seat(s)
- Air Conditioning
- 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
- Leather Seats
- 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
The GMC Sierra 3500 received a rating of 3 out of 5 stars from RepairPal, which RepairPal describes as Average. This rating ranks the GMC Sierra 3500 as 13 out of 19 among Fullsize Truck
The 2021 GMC Sierra 3500 has a maximum towing capacity of 20000 pounds, when properly equipped. Various factors may impact towing capacity, including weight of passengers, cargo, and options/accessories.
Here is what's new for the 2021 GMC Sierra 3500:
- Automated Cruise Control
- Rear Air Conditioning
- Kicker Speaker System
- Satellite Radio Ready
- Rear View Camera
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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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