Used 2020 GMC Sierra 3500HD for Sale nearChicago, IL

How much does the 2020 GMC Sierra 3500HD cost?

Prices have softened 10.04% compared to this time last year, making it a favorable time to shop this model year.

There are 554 listings available, which gives you a meaningful amount of inventory to compare.

Is the 2020 GMC Sierra 3500HD a good car?

Yes — the 2020 GMC Sierra 3500HD earns a 5/5 user rating, which points to very strong owner satisfaction. Owners consistently praise its impressive performance, especially when pulling heavy loads, along with its comfortable, well-built feel. The model’s broad range of cab, bed, and rear-axle configurations also makes it useful whether you want a basic jobsite truck or a more specialized towing setup. With 34.3% of listings marked as good or great deals, there is still room to shop selectively.

Is the 2020 GMC Sierra 3500HD reliable?

Owners rate it 5/5, a strong signal of long-term satisfaction.

Owner feedback highlights a truck that feels dependable, well-built, and capable over time, especially when you need it for heavy-duty work. Many owners also say they trust it more than some competing heavy-duty pickups, which reinforces the sense that it can be a truck you count on. For used buyers, that kind of satisfaction suggests lower ownership anxiety, though you should still verify maintenance history and overall condition before committing.

What should I look for when buying a used 2020 GMC Sierra 3500HD?

At 71.1% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.

You should run a vehicle history report on every candidate and pay close attention to any prior collision, repair, or title issues. A pre-purchase inspection matters here because heavy-duty trucks can hide wear from towing, hauling, and jobsite use. Focus your inspection on frame condition, suspension, brakes, tires, and signs of uneven wear or poor repair quality.

Is now a good time to buy a used 2020 GMC Sierra 3500HD?

This looks like a moderate, selective buyer’s market, so you can shop patiently and still find worthwhile options.

• Deal availability: 34.3% of listings are priced as good or great deals.
• Inventory: There are 554 listings available.
• Price trend: Prices have softened 10.04% compared with last year.
• Clean inventory: 71.1% of listings are accident-free.

If you find a listing below $48,330, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2020 GMC Sierra 3500HD's resale value?

The current average of $48,330 sits slightly below last year's $53,722.

That price movement suggests the market has already adjusted downward, which can help you if you buy now and hold the truck for a while. If demand stays steady for well-kept heavy-duty trucks, a cleaner example with strong equipment and a solid history should be easier to resell later than one with accident damage or heavy wear. For future sellers, the key is preserving condition and documentation so your truck stands out when it’s time to list it.

Vehicles with strong owner satisfaction ratings, like this model year's 5/5, tend to retain buyer demand, which supports resale value over time.

Should I buy a 2020 GMC Sierra 3500HD or consider a different year?

If you're weighing the 2020 against nearby model years, here's how to think about it:

Choose the 2020 if:

• 34.3% of listings are priced as good or great deals.
• At 71.1% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 10.04% compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.

The bottom line: The 2020 is the better pick if you want the newer redesign, strong owner satisfaction, and a market that has softened enough to create buying opportunities. If your priority is stretching your budget further, a nearby older year may be worth considering, but you should expect to trade away some of the 2020’s refinement and updated capability.

How does the 2020 GMC Sierra 3500HD compare to the 2020 Ford F-350 Super Duty?

These recommendations are based on CarGurus' proprietary market data from November 10, 2026, CarGurus experts' opinions, and generative AI.