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Channel: Sierra AT4 HD | GM Authority
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2020 GMC Sierra AT4 HD Will Haul Many Things Deep Into The Woods

But the total weight of those things remain a mystery.

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Watch GMC Intro The 2020 Sierra HD In A San Diego Shipyard: Video

Watch the big reveal for the Sierra HD beast here.

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2020 Sierra HD Introduces Transparent Trailer View: Feature Spotlight

This unique camera view makes the Sierra's trailer virtually invisible.

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Most GMC Sierra HD Buyers Opt For Denali Trim With Duramax V-8 Engine

Some interesting stats about GMC's biggest pickups.

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2020 Sierra AT4 HD: Live Photo Gallery

Get up close and personal with the Sierra AT4 Heavy Duty.

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The Ford Tremor Puts GM At A Disadvantage (With Poll)

Ford's new off-roader should have GM rethinking its trim level strategy.

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2020 GMC Sierra HD Configurator Now Live

But only for the Sierra HD AT4 and Denali trims.

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Every GMC Model Will Have AT4 Variant By 2021

Probably not Savana, though.

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What It’s Like To Tow 30,000 Pounds With The 2020 GMC Sierra HD

Color us impressed. Very impressed.

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What It’s Like Driving The 2020 GMC Sierra HD AT4

Now you can tow heavy things and play in the mud.

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2020 GMC Sierra AT4 2500HD Duramax Fuel Economy Tested

Are the results up to par?

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2020 Ford Super Duty Tremor Offers Integrated Factory Winch, Joining Ram

Will GMC respond?

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Pricing Comparison: GMC Sierra HD AT4 vs. Ford Super Duty Tremor vs. Ram 2500...

All the dollars needed for HD off-road goodness.

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2021 GMC Sierra 2500HD: Here’s What’s New And Different

Every single change, outlined in complete detail.

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The GMC Denali And AT4 Sub-Brands Are Outselling Cadillac

Customers have no problem paying $90,000 for a Denali or AT4 product.

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2021 GMC Sierra HD Gets Black Power-Retractable Assist Steps

Only in the AT4 trim level, though.

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2021 GMC Sierra HD Gets Reduced Assist Step Availability

Due to constraints in the supply chain.

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2021 GMC Sierra Gets New Illuminated Front GMC Emblem

A more premium appearance for the AT4 and Denali.

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2023 GMC Sierra HD AT4 With Potential Denali Package Spied

Shiny trim bits everywhere.

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