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  • Onyx Black 2020 GMC Sierra 3500 AT4Onyx Black 2020 GMC Sierra 3500 AT4Onyx Black 2020 GMC Sierra 3500 AT4Onyx Black 2020 GMC Sierra 3500 AT4Onyx Black 2020 GMC Sierra 3500 AT4Onyx Black 2020 GMC Sierra 3500 AT4

    $48,998

    $899
    95,370 mi.
    Est. $923/mo

    Bolivar Ford

    Bolivar, TN (463 mi)
    Check Availability

  • Onyx Black 2020 GMC Sierra 3500 AT4Onyx Black 2020 GMC Sierra 3500 AT4Onyx Black 2020 GMC Sierra 3500 AT4Onyx Black 2020 GMC Sierra 3500 AT4Onyx Black 2020 GMC Sierra 3500 AT4Onyx Black 2020 GMC Sierra 3500 AT4

    $48,998

    $899
    95,370 mi.
    Est. $923/mo

    Bolivar Ford

    Bolivar, TN (463 mi)
    Check Availability

  • Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4

    $33,588

    199,622 mi.
    Est. $633/mo

    Ames Ford

    4.9
    Ames, IA (308 mi)
    Check Availability
  • Summit White 2020 GMC Sierra 3500 AT4Summit White 2020 GMC Sierra 3500 AT4Summit White 2020 GMC Sierra 3500 AT4Summit White 2020 GMC Sierra 3500 AT4Summit White 2020 GMC Sierra 3500 AT4Summit White 2020 GMC Sierra 3500 AT4

    $52,500

    88,669 mi.
    Est. $989/mo

    Perry Auto Sales

    Perry, MI (187 mi)
    Check Availability
  • Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4

    $45,995

    105,220 mi.
    Est. $866/mo

    Cernohous Chevrolet, Inc.

    Prescott, WI (327 mi)
  • Pacific Blue Metallic 2020 GMC Sierra 3500 AT4Pacific Blue Metallic 2020 GMC Sierra 3500 AT4

    $55,861

    $566
    63,599 mi.
    Est. $1,052/mo

    Harvest Chevrolet

    3.8
    Yakima, WA (1,646 mi)
  • Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4Carbon Black Metallic 2020 GMC Sierra 3500 AT4

    Not Priced

    221,245 mi.
    Est. $0/mo

    Rob Sight Ford

    4.8
    Kansas City, MO (422 mi)
    Check Availability
  • $55,775

    52,785 mi.
    Est. $1,051/mo

    Grubbs Mazda of Wichita Falls

    Wichita Falls, TX (808 mi)
    Check Availability
  • $55,596

    58,298 mi.
    Est. $1,047/mo

    Corwin Ford

    4.6
    Nampa, ID (1,463 mi)
    Check Availability

GMC Sierra 3500 prices by year

Model year Average price Deals
2026 GMC Sierra 3500 AT4 10 Great deals
2025 GMC Sierra 3500 AT4 $73,526 27 Great deals
2024 GMC Sierra 3500 AT4 $63,971 22 Great deals
2023 GMC Sierra 3500 AT4 $57,417 9 Great deals
2022 GMC Sierra 3500 AT4 $54,938 17 Great deals

About the 2020 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 2020 GMC Sierra 3500 AT4
FAQs

How much does the 2020 GMC Sierra 3500 AT4 cost?

The 2020 GMC Sierra 3500 AT4 price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2020 Sierra 3500 AT4 is $49,291, with pricing starting at $33,588.

What are some similar vehicles and competitors of the 2020 GMC Sierra 3500 AT4?

The 2020 GMC Sierra 3500 AT4 compares to and/or competes against the following vehicles:


Is the 2020 GMC Sierra 3500 AT4 reliable?

The 2020 GMC Sierra 3500 has an average reliability rating of 4.9 out of 5 according to Cars.com consumers. Find real-world reliability insights within consumer reviews from 2020 Sierra 3500 owners.

Ratings (9 reviews)

100% of drivers recommend this car

Rating breakdown (out of 5):
Comfort
4.9
Interior
4.9
Performance
4.9
Value
4.7
Exterior
5.0
Reliability
4.9
Trims

AT4 (2 styles)

Style
4WD Crew Cab 159" AT4 4WD Crew Cab 172" AT4
Inventory price
Starting at $59,500 Starting at $59,700
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)

2020 GMC Sierra 3500 trims