Video Review: 2021 GMC Sierra AT4

The 2021 Sierra pickup truck comes in an AT4 package that adds some off-road upgrades and a few interior details and technologies. It’s an exciting setup for a good price point and worth a look. The diesel engine upgrade option is also a nice bonus. Here’s Aaron’s assessment of the 2021 GMC Sierra in its AT4 package.

Aaron Turpen
An automotive enthusiast for most of his adult life, Aaron has worked in and around the industry in many ways. He is an accredited member of the Rocky Mountain Automotive Press (RMAP), the Midwest Automotive Media Association (MAMA), the Texas Auto Writers Association (TAWA), and freelances as a writer and journalist around the Web and in print. You can find his portfolio at