Spied: 2024 Chevy Silverado HD (or GMC Sierra HD) Lineup Is Caught in the Wild

Are they hiding the new 505 HP Duramax V8?

2024 chevy silverado hd 2500 3500 gmc sierra towing spied
image: Scott Matson

Take a look at this recent image of upcoming 2024 Chevy Silverado HD (or GMC Sierra HD) prototype trucks spied in the wild of Colorado. Big thanks to Scott Matson for sending us this image. It appears that several trim levels of the upcoming heavy-duty pickup trucks are being tested at the same time. To make it more exciting, Scott reports that he saw a current Ford Super Duty pickup truck near these GM prototypes. Are these really 2024 model year trucks? Are they 2023 models? What’s under the hood? We have some new information.

2024 Chevy Silverado HD

Since we last did a major story about the upcoming GM heavy-duty pickup trucks in September 2021, I wrongly referred to similar prototypes as 2023 trucks. Indeed, I was hopeful that GM will release these updated pickup trucks sooner rather than later. These are rumored to have the upgraded Duramax turbo-diesel V8 engine with additional power, torque, and capability.

We had unofficial information that the upgraded Duramax turbo-diesel V8 engine will have around 505 horsepower and 1,085 lb-ft of torque. New information from the GM Fleet Order Guide says that 2023 GM HD trucks will continue with VERY minimal changes. The Fleet Order Guide says the 2023 model-year GM HD pickup trucks will continue with the current engines, including the L5P 6.6L turbo-diesel V8 with 445 hp and 910 lb-ft of torque.

Since GM continues to test these prototype trucks in the real world suggests that the company has not abandoned the upgrades. Thus, I will refer to these GM prototypes as 2024 models. I hope these come to market with an upgraded diesel engine as soon as possible.