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  • Onyx Black 2021 GMC Sierra 3500 AT4Onyx Black 2021 GMC Sierra 3500 AT4Onyx Black 2021 GMC Sierra 3500 AT4Onyx Black 2021 GMC Sierra 3500 AT4Onyx Black 2021 GMC Sierra 3500 AT4Onyx Black 2021 GMC Sierra 3500 AT4

    $52,500

    63,535 mi.
    Est. $987/mo

    MB Motors - Bellingham

    4.7
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    Bellingham, WA (1,741 mi)
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  • Summit White 2021 GMC Sierra 3500 AT4Summit White 2021 GMC Sierra 3500 AT4Summit White 2021 GMC Sierra 3500 AT4Summit White 2021 GMC Sierra 3500 AT4Summit White 2021 GMC Sierra 3500 AT4Summit White 2021 GMC Sierra 3500 AT4

    $53,784

    $1K
    55,903 mi.
    Est. $1,011/mo

    Rairdons Nissan of Auburn

    4.6
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    Auburn, WA (1,728 mi)
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  • Summit White 2021 GMC Sierra 3500 AT4Summit White 2021 GMC Sierra 3500 AT4Summit White 2021 GMC Sierra 3500 AT4Summit White 2021 GMC Sierra 3500 AT4Summit White 2021 GMC Sierra 3500 AT4

    $53,704

    68,333 mi.
    Est. $1,009/mo

    Snell Motors

    Check Availability
    Mankato, MN (356 mi)
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  • Ebony Twilight Metallic 2021 GMC Sierra 3500 AT4Ebony Twilight Metallic 2021 GMC Sierra 3500 AT4Ebony Twilight Metallic 2021 GMC Sierra 3500 AT4Ebony Twilight Metallic 2021 GMC Sierra 3500 AT4Ebony Twilight Metallic 2021 GMC Sierra 3500 AT4Ebony Twilight Metallic 2021 GMC Sierra 3500 AT4

    $42,990

    $1K
    152,703 mi.
    Est. $808/mo

    West Metro Buick GMC

    5.0
    Check Availability
    Monticello, MN (389 mi)
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GMC Sierra 3500 prices by year

Model year Average price Deals
2026 GMC Sierra 3500 AT4 7 Good deals
2025 GMC Sierra 3500 AT4 $76,774 22 Good deals
2024 GMC Sierra 3500 AT4 $68,538 5 Great deals
2023 GMC Sierra 3500 AT4 $59,811 9 Great deals
2022 GMC Sierra 3500 AT4 $53,854 7 Great deals

About the 2021 GMC Sierra 3500 AT4

Basics

AT4 shown.

Seating
5
Door count
4
Drivetrain
Four Wheel Drive
Combined MPG
0
Transmission
6-Speed A/T
Engine
445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)
Side view of the 2021 GMC Sierra 3500 AT4
FAQs

How much does the 2021 GMC Sierra 3500 AT4 cost?

The 2021 GMC Sierra 3500 AT4 price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 3500 AT4 is $50,745, with pricing starting at $42,990.

What are some similar vehicles and competitors of the 2021 GMC Sierra 3500 AT4?

The 2021 GMC Sierra 3500 AT4 compares to and/or competes against the following vehicles:


Is the 2021 GMC Sierra 3500 AT4 reliable?

The 2021 GMC Sierra 3500 has an average reliability rating of 4 out of 5 according to Cars.com consumers. Find real-world reliability insights within consumer reviews from 2021 Sierra 3500 owners.

Ratings (2 reviews)

100% of drivers recommend this car

Rating breakdown (out of 5):
Comfort
4.5
Interior
4.5
Performance
5.0
Value
4.0
Exterior
4.5
Reliability
4.0
Trims

AT4 (2 styles)

Style
4WD Crew Cab 172" AT4 4WD Crew Cab 159" AT4
Inventory price
Starting at $60,500 Starting at $60,300
Combined MPG
0 0
Engine
445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)
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GMC Sierra 3500 trims