2021 GMC Sierra 2500HD AT4 Specs and Features

When the new line of AT4-badged models arrived a couple of years ago, everyone was excited to see GMC with some more serious off-road works. Initially, we expected to see these upgrades on SUVs and smaller trucks but the company used the same approach on HD models as well. That’s why expectations for the 2021 GMC Sierra 2500HD AT4 are pretty big, even though there won’t be too many changes on the list of standard and available features.

Practically, the list of novelties includes just a couple of things. For example, you may count on new high-gloss black mirror caps as standard along with optional LPO-level (dealer-installed features) high clearance step. Also, there are new color options in the offer. Other than that, the next-year model will remain pretty much the same.

2021 GMC Sierra 2500HD AT4

2021 GMC Sierra 2500HD AT4 Design

When it comes to the base design, the 2021 GMC Sierra 2500HD AT4 won’t be any different than the current model. This is basically a standard 2500 model, which comes with just a couple of upgrades that make this truck more capable in terms of the off-road performance. For example, you may count on things like Rancho monotube shock absorbers, which provide two more inches of ground clearance. Furthermore, there are several skid plates for underbody protection, as well as hill descent control, which is standard in all AT4 models. Also, there is a Traction Select system, which allows you to choose different modes, depending on the surface. The list of standard features also includes a two-speed transfer case. All-terrain tires are standard, while you can also get mud-terrain tires.


As we already mentioned, the only thing we are about to see for the next year is the addition of new color options. Other than that, the exterior look will remain pretty much the same. Therefore, you may count that the 2021 Sierra 2500HD AT4 will come with several exclusive details, which will accentuate its off-road character. For example, there are different front and rear bumpers, as well as unique wheels and fender flares. The grille features a different pattern and pretty much all surfaces have been blacked out. In contrast, you can find two red tow hooks at the front.

2021 GMC Sierra 2500HD AT4 front


On the inside, the 2021 GMC Sierra 2500HD AT4 isn’t much different compared to the rest of the lineup. We are about to see a familiar cabin design, which hasn’t changed too much with the recent redesign. Some may find the current design a little bit disappointing, but the cabin is actually pretty functional. It is also very spacious, as the AT4 model comes in the Crew Cab variant only. Of course, you may also count on a pretty long list of standard equipment, which includes all kinds of latest tech goodies.

2021 GMC Sierra 2500HD AT4 Engines

When it comes to the powertrain, we definitely won’t see any changes. The 2021 Sierra 2500HD AT4 will carry on with two familiar engine options. The base model will come with a 6.6-liter gasoline V8, which puts out around 401 horsepower and 464 pound-feet of torque. It comes in pair with a 6-speed automatic transmission. You can also get a diesel, which comes with a familiar 6.6-liter unit, which is good for about 445 horsepower and 910 pound-feet of torque. This engine comes in pair with a 10-speed automatic gearbox.

2020 GMC Sierra HD AT4

2021 GMC Sierra 2500HD AT4 Release Date and Price

We expect that the 2021 GMC Sierra 2500HD AT4 will hit the market sometime in the last quarter of the year. The base price should go around 58.000 dollars. When it comes to rivals, some of the models we should mention are Ford F-250 Tremor, Ram Power Wagon etc.

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