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2021 GMC Sierra 3500 HD AT4, front three-quarter view, paint 1 of 8

Paint 1 of 8

2021 GMC Sierra 3500 HD AT4

Truck (Crew Cab) · 401 hp

Sticker from
$59,600Factory MSRP, base configuration

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47 factory options, from $35 to $9,890.

Duramax 6.6L Turbo-Diesel V8 Engine$9,890
AT4 Premium Plus Package$6,975
20" High Gloss Black Aluminum Wheels w/Machined Finish$2,995
20" High Gloss Black Painted Wheels$2,995
AT4 Preferred Package$2,075
Technology Package$1,275
Bedside Storage Boxes$1,250
AT4 High Clearance Step$1,095
Power Glass Sunroof$995
Black Sport Step$965
Driver Alert Package I$890
MultiPro Audio System by Kicker$815
20" Machined Aluminum Wheels w/High Gloss Black Accents$800
Gooseneck/5th Wheel Package$795
Tri-fold Soft Tonneau Cover$700
Body Color Wheel Arch Moldings$685
Driver Alert Package II$645
Auxiliary Trailer Camera$595
Cargo Convenience Package$515
Dual Alternators$380
Snow Plow Prep/Camper Package$300
Gooseneck Hitch Package$295
Lockable Console Vault$295
Rear Under Seat Storage$275
AT4 All-Weather Floor Liners$260
Bed View Camera$250
LT275/65R20 All-Terrain Blackwall Tires$200
GMC MultiPro Tailgate Step Lights$200
High Idle Switch$200
Black Front and Rear Molded Splash Guards$190
Upfitter Switch Kit$150
220 Amp Alternator$150
Auxiliary Battery$135
Cargo Tie-Down Rings$105
Engine Block Heater$100
Console Insert Organizer Tray$70
Smoked Amber LED Roof Marker Lamps$55
Trailer Tire Pressure Monitor Sensors$50
Heavy Duty Front Spring/Camper Package$45
Trailering Wiring Provisions$35
California Emissions Override—
California State Emissions Requirements—
Federal Emissions Override—
Federal Emissions Requirements—
Front License Plate Kit—
Northeast Emissions—
State-Specific Emissions Override—

Which Sierra 3500 HD is right for you?

Five trims, $37,100 to $66,100. Tap one to open it.

$37,100−$22,500Base401 hp$42,200−$17,400SLE401 hp$54,000−$5,600SLT401 hp$59,600This trimAT4401 hp$66,100+$6,500Denali401 hp

Bar heights follow the price. The widest step is $11,800, from SLE to SLT.

The numbers.

Two configurations: four-wheel drive, 6-speed automatic.

401hp6.6L eight-cylinder
464lb-ftTorque
4WD6-speed shiftable automatic
5Seats
6,947–7,064 lbsCurb weight
11,350–11,500 lbsGVWR
20,000 lbsMax towing
4,365–4,398 lbsMax payload

129 standard items.

Five groups, sized by how much is in each.

1 interior

  • Jet Black with Kalahari accents

Leather.

6 factory paints

  • Pacific Blue Metallic
  • Summit White
  • Onyx Black
  • Brownstone Metallic
  • Cayenne Red Tintcoat
  • Ebony Twilight Metallic

Safety and recalls

No recall campaigns on file.

Recalls are settled per car, not per model. Check the one you are buying.

Overall—Not rated
Frontal—Not rated
Side—Not rated
Rollover—Not rated

NHTSA has not published ratings for the 2021 Sierra 3500 HD. A model year is often unrated for a year or more after it goes on sale.

NHTSA NCAP · checked Oct 2026

Factory coverage.

It runs from the first sale date, not the model year.

Basic
3 yr / 36,000 mi
Powertrain
5 yr / 60,000 mi
Rust
6 yr / 100,000 mi
Roadside
5 yr / 60,000 mi
Maintenance
1 yr
Sold2 yr4 yr6 yr
See extended plan pricesLive prices for this car. They depend on its age and mileage.See prices

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What would this Sierra 3500 HD cost to insure?

Advertiser disclosure: we may earn a commission when you get a quote or buy through links on this page. Rates depend on the driver, the car and the ZIP.

Other years of the Sierra 3500 HD AT4.

2022 Sierra 3500 HD AT4

$60,300$700 more6 colors · starting MSRP

2020 Sierra 3500 HD AT4

$58,900$700 less7 colors · starting MSRP

2023 Sierra 3500 HD AT4

$67,800$8,200 more6 colors · starting MSRP

Pictures show this year's car in another paint. Starting MSRP is before destination, taxes and dealer fees.