The diesel engine is carryover, making the same 445 hp and 910 lb-ft as it did in the 2019 Sierra HD. Also new is a 6.6-liter gasoline V-8, which replaces an outgoing 6.0-liter V-8, making a stout ...

The Sierra 2500HD's standard engine is a 6.6-liter gasoline V-8 that ... luxurious in the grand scheme of things. 2024 GMC Sierra HD: Worth Waiting For? For 2024, GMC will apply a slate of updates ...