Skip to main content

2021 GMC Sierra 3500 AT4 specs & colors

MSRP
2WD Reg Cab 142"
$37,400
2WD Double Cab 162"
$40,200
4WD Reg Cab 142"
$40,200
2WD Crew Cab 159"
$41,800
2WD Crew Cab 172"
$42,000
2WD Reg Cab 142" SLE
$42,800
4WD Double Cab 162"
$43,000
4WD Crew Cab 159"
$44,600
4WD Crew Cab 172"
$44,800
2WD Double Cab 162" SLE
$45,000
4WD Reg Cab 142" SLE
$45,600
2WD Crew Cab 159" SLE
$46,600
2WD Crew Cab 172" SLE
$46,800
4WD Double Cab 162" SLE
$47,800
4WD Crew Cab 159" SLE
$49,400
4WD Crew Cab 172" SLE
$49,600
2WD Crew Cab 159" SLT
$54,600
2WD Crew Cab 172" SLT
$54,800
4WD Crew Cab 159" SLT
$57,400
4WD Crew Cab 172" SLT
$57,600
4WD Crew Cab 159" AT4
$60,300
4WD Crew Cab 172" AT4
$60,500
4WD Crew Cab 159" Denali
$66,700
4WD Crew Cab 172" Denali
$66,900
$60,300
Starting MSRP
Current listing price
2021 GMC Sierra 3500 AT4

Showing the 2021 GMC Sierra 3500 4WD Crew Cab 159" AT4

Shop Now

Key specs

  • 4-door
  • 5 seats
  • 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)
  • 0 combined MPG
  • - TBD -" length, 80.24" height
  • Four Wheel Drive

Color options

Exterior

Oxford Brown Metallic

Interior
Jet Black with Kalahari accents

Packages

  • AT4 Preferred Equipment Group

    $0

    Starting MSRP

    • includes standard equipment

Specifications

Highlights

Engine Type
Gas V8
MPG
-
Horsepower
401 hp
445 hp
Seating Capacity
5

Brakes

Brake Type
Pwr
Brake ABS System
4-Wheel
Brake ABS System (Second Line)
N/A
Disc - Front (Yes or )
Yes
Disc - Rear (Yes or )
Yes
Front Brake Rotor Diam x Thickness
14 x 1.6 in
Rear Brake Rotor Diam x Thickness
14.1 x 1.3 in
Drum - Rear (Yes or )
N/A

Electrical

Maximum Alternator Capacity (amps)
170
Cold Cranking Amps @ 0° F (Primary)
720

Engine

SAE Net Horsepower @ RPM
401 @ 5200
SAE Net Torque @ RPM
464 @ 4000
Displacement
6.6L/-TBD-
Engine Type
Gas V8
Transmission Options
6-Speed A/T
10-Speed A/T
A/T
MPG
-
Total Cooling System Capacity
N/A

Entertainment

Bluetooth®
Standard
Bluetooth®
Optional

Measurements

Front Shoulder Room
66 in
Front Leg Room
45 in
Front Head Room
43 in
Overhang, Rear w/o bumper
N/A
Overhang, Front
N/A
Height, Overall
81 in
Width, Max w/o mirrors
82 in
Length, Overall
250 in
Length, Overall w/rear bumper
N/A
Length, Overall w/o rear bumper
N/A
Wheelbase
159 in
Second Hip Room
60 in
Second Shoulder Room
65 in
Second Leg Room
43 in
Second Head Room
40 in
Front Hip Room
61 in
Ext'd Cab Cargo Volume
N/A
Cargo Volume
70 ft³
Tailgate Width
N/A
Cargo Box (Area) Height
21 in
Cargo Box Width @ Wheelhousings
52 in
Cargo Box Width @ Floor
71 in
Cargo Box Width @ Top, Rear
N/A
Cargo Box Length @ Floor
82 in
Ground Clearance, Rear
11 in
Ground Clearance, Front
11 in
Ground to Top of Load Floor
N/A
Cab to End of Frame
N/A
Passenger Capacity
5

Safety

Backup Camera
Optional
Stability Control
Standard

Steering

Steering Type
Pwr Recirculating Ball
Steering Ratio (:1), Overall
N/A
Turning Diameter - Curb to Curb
53 ft
Turning Diameter - Wall to Wall
N/A

Suspension

Suspension Type - Front
Short/Long Arm w/Torsion Bars
Suspension Type - Rear
3-Stage Multi-Leaf
Axle Type - Front
Independent
Axle Type - Rear
N/A

Tires & Wheels

Front Tire Size
LT275/70R18
Rear Tire Size
LT275/70R18
Spare Tire Size
LT275/70R18
Front Wheel Size
18 x 8 in
Rear Wheel Size
18 x 8 in
Spare Wheel Size
18 x 8 in
Front Wheel Material
Aluminum
Rear Wheel Material
Aluminum
Spare Wheel Material
Steel

Weight & Capacity

Aux Fuel Tank Capacity, Approx
N/A
Fuel Tank Capacity, Approx
36 gal
Curb Weight
6,766 lbs
Gross Axle Weight Rating
12,050 lbs
Total Option Weight
0 lbs
Gross Vehicle Weight Rating
11,350 lbs
Base Curb Weight
N/A
Curb Weight - Front
3,851 lbs
Curb Weight - Rear
2,915 lbs
Option Weight - Front
0 lbs
Option Weight - Rear
0 lbs
Gross Combined Wt Rating
24,000 lbs
As Spec'd Curb Weight
7,033 lbs
As Spec'd Payload
4,317 lbs
Maximum Payload Capacity
4,584 lbs
Maximum Trailering Capacity
20,000 lbs
Fifth Wheel Hitch - Max Tongue Wt.
4,057 lbs
Fifth Wheel Hitch - Max Trailer Wt.
16,230 lbs
Wt Distributing Hitch - Max Tongue Wt.
1,450 lbs
Wt Distributing Hitch - Max Trailer Wt.
14,500 lbs
Dead Weight Hitch - Max Tongue Wt.
500 lbs
Dead Weight Hitch - Max Trailer Wt.
5,000 lbs

Compare trims

2021 GMC Sierra 3500 AT4

Wondering which trim is right for you?