Sierra AT4 HD News

Some GMC Sierra HD, Savana Units Need A Power Steering Pump Replacement

The pumps in some vehicles may prematurely fail.

Read More »

Some 2024 Chevy Silverado HD, GMC Sierra HD Units Will Need A Remote Start Fix

Involving an improper check engine light.

Read More »

GMC Sierra HD Avoids Highway Traffic By Driving Through Ditch: Video

Pickup versus grassy embankment.

Read More »

Kitten Rescued From Engine Bay Of GMC Sierra HD

Furry friend adopted and named "Diesel."

Read More »

2025 GMC Sierra HD Gets Standard Adaptive Cruise Control On More Trim Levels

Now four trims instead of two.

Read More »

AT4 And Denali Trims Made Up Almost Half Of GMC Sales In 2022

Average transaction prices are on the rise as well.

Read More »

2024 GMC Sierra HD Series Designation Moves To Front Bumper

This badge indicates the capacity of the truck.

Read More »

2024 GMC Sierra HD AT4: The Heavy Duty Off-Roader

The off-road-capable truck gets updates to the exterior and interior.

Read More »

Custom 2022 GMC Sierra AT4 HD Looks Great In Black And White: Video

Can't go wrong with black and white.

Read More »

GMC Sierra HD Discount Offers Interest-Free Financing In April 2022

Local market leases are also available on the heavy-duty pickup.

Read More »

GMC Sierra HD Wins J.D. Power 2022 U.S. ALG Residual Value Award

Beating out key rivals from Ford and Ram.

Read More »

2023 GMC Sierra HD AT4 With Potential Denali Package Spied

Shiny trim bits everywhere.

Read More »

2021 GMC Sierra Gets New Illuminated Front GMC Emblem

A more premium appearance for the AT4 and Denali.

Read More »

2021 GMC Sierra HD Gets Reduced Assist Step Availability

Due to constraints in the supply chain.

Read More »

2021 GMC Sierra HD Gets Black Power-Retractable Assist Steps

Only in the AT4 trim level, though.

Read More »

The GMC Denali And AT4 Sub-Brands Are Outselling Cadillac

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

Read More »

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

Every single change, outlined in complete detail.

Read More »

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

All the dollars needed for HD off-road goodness.

Read More »

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

Will GMC respond?

Read More »

2020 GMC Sierra AT4 2500HD Duramax Fuel Economy Tested

Are the results up to par?

Read More »

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

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

Read More »

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

Color us impressed. Very impressed.

Read More »

Every GMC Model Will Have AT4 Variant By 2021

Probably not Savana, though.

Read More »

2020 GMC Sierra HD Configurator Now Live

But only for the Sierra HD AT4 and Denali trims.

Read More »

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

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

Read More »

2020 Sierra AT4 HD: Live Photo Gallery

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

Read More »

Load More Stories