Yesterday, GMC surprised us with a teaser of what’s to come with a photo of an updated 2017 GMC Sierra 2500HD Denali. The major news here is the mail-slot hood scoop that hints at some significant powertrain improvements for the Sierra HD, and likely the 2017 Chevrolet Silverado HD, as well.
Currently, there are more questions than there are answers, and it all deserves conversation. While we don’t have much info on the 2017 GMC Sierra HD powertrain, we also don’t have huge expectations that this teaser will lead to an entirely new powertrain. Instead, we believe it to be an updated version of the current 6.6L LML Duramax engine with bumps in horsepower and torque, thanks to expected cooling improvements. However, we have eaten our words before. From here, we invite you to opine in the comments, and participate in our poll below.