Skip to main content
Best match Lowest price Highest price Lowest mileage Highest mileage Nearest location Best deal Newest year Oldest year Newest listed Oldest listed
Skip to Filters
  • Summit White 2021 GMC Sierra 3500 SLESummit White 2021 GMC Sierra 3500 SLESummit White 2021 GMC Sierra 3500 SLESummit White 2021 GMC Sierra 3500 SLESummit White 2021 GMC Sierra 3500 SLESummit White 2021 GMC Sierra 3500 SLE

    $38,338

    151,934 mi.
    Est. $721/mo

    Freeman Buick GMC

    3.2
    Check Availability
    Grapevine, TX (807 mi)

    Quick view
  • Cayenne Red Tintcoat 2021 GMC Sierra 3500 SLECayenne Red Tintcoat 2021 GMC Sierra 3500 SLECayenne Red Tintcoat 2021 GMC Sierra 3500 SLECayenne Red Tintcoat 2021 GMC Sierra 3500 SLECayenne Red Tintcoat 2021 GMC Sierra 3500 SLECayenne Red Tintcoat 2021 GMC Sierra 3500 SLE

    $51,987

    41,762 mi.
    Est. $977/mo

    Dan Cummins Chevrolet Buick of Paris

    4.7
    Check Availability
    Paris, KY (311 mi)
    Quick view
  • Onyx Black 2021 GMC Sierra 3500 SLEOnyx Black 2021 GMC Sierra 3500 SLEOnyx Black 2021 GMC Sierra 3500 SLEOnyx Black 2021 GMC Sierra 3500 SLEOnyx Black 2021 GMC Sierra 3500 SLEOnyx Black 2021 GMC Sierra 3500 SLE

    $47,988

    $1K
    89,286 mi.
    Est. $902/mo

    101 AUTO OUTLET

    4.0
    Check Availability
    Scottsdale, AZ (1,445 mi)
    Quick view
  • Quicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLE

    $49,703

    78,634 mi.
    Est. $934/mo

    Titus-Will Used Cars and Trucks - Sumner

    Check Availability
    Sumner, WA (1,727 mi)
    Quick view
  • Cayenne Red Tintcoat 2021 GMC Sierra 3500 SLECayenne Red Tintcoat 2021 GMC Sierra 3500 SLECayenne Red Tintcoat 2021 GMC Sierra 3500 SLECayenne Red Tintcoat 2021 GMC Sierra 3500 SLE

    $35,999

    126,899 mi.
    Est. $677/mo

    Crossroads Chevrolet

    3.9
    Check Availability
    Mount Hope, WV (441 mi)
    Quick view
  • Quicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLE

    $46,979

    85,178 mi.
    Est. $883/mo

    Shottenkirk Honda Huntsville

    4.9
    Check Availability
    Huntsville, AL (496 mi)
    Quick view
  • Quicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLEQuicksilver Metallic 2021 GMC Sierra 3500 SLE

    $43,000

    108,008 mi.
    Est. $808/mo

    Savvy Auto Sales LLC of COLUMBUS

    Check Availability
    COLUMBUS, OH (272 mi)
    Quick view

GMC Sierra 3500 prices by year

Model year Average price Deals
2026 GMC Sierra 3500 SLE 3 Good deals
2025 GMC Sierra 3500 SLE $62,053 5 Great deals
2024 GMC Sierra 3500 SLE $55,058 15 Great deals
2022 GMC Sierra 3500 SLE $45,682 8 Great deals

About the 2021 GMC Sierra 3500 SLE

Basics

SLE shown.

Seating
3
Door count
2
Drivetrain
Rear 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 SLE
FAQs

How much does the 2021 GMC Sierra 3500 SLE cost?

The 2021 GMC Sierra 3500 SLE price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 3500 SLE is $44,856, with pricing starting at $35,999.

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

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


Is the 2021 GMC Sierra 3500 SLE 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

SLE (8 styles)

Style
4WD Reg Cab 142" SLE 2WD Reg Cab 142" SLE 4WD Crew Cab 159" SLE 4WD Crew Cab 172" SLE 2WD Crew Cab 159" SLE 2WD Crew Cab 172" SLE 2WD Double Cab 162" SLE 4WD Double Cab 162" SLE
Inventory price
Starting at $45,600 Starting at $42,800 Starting at $49,400 Starting at $49,600 Starting at $46,600 Starting at $46,800 Starting at $45,000 Starting at $47,800
Combined MPG
0 0 0 0 0 0 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) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)
Skip to Listings
Best match Lowest price Highest price Lowest mileage Highest mileage Nearest location Best deal Newest year Oldest year Newest listed Oldest listed

GMC Sierra 3500 trims