The 2024 GMC Sierra HD introduces a full model refresh for the heavy-duty pickup, unveiling a new exterior style, an overhauled cabin space, a new trim level lineup, and powertrain updates as well. Now, GM Authority has learned details regarding the updated exterior paint options list introduced with the 2024-model-year refresh.
The new 2024 GMC Sierra HD exterior paint options list now includes (relevant paint codes listed in parentheses):
- Downpour Metallic (GXP)
- Redwood Metallic (G48)
- Sterling Metallic (GXD)
- Thunderstorm Gray (GNO)
- Titanium Rush Metallic (G6M)
- Volcanic Red Tintcoat (GNT)
These six new hues replace six outgoing paint colors, which include:
- Cayenne Red Tintcoat (GSK)
- Ebony Twilight Metallic (GB8)
- Forest Metallic (GHR)
- Hunter Metallic (GED)
- Quicksilver Metallic (GAN)
- Pacific Blue Metallic (GA0)
One of the most important updates for the 2024-model-year refresh is the introduction of the premium 2024 GMC Sierra HD Denali Ultimate and GMC Sierra HD AT4X off-roader, the former of which incorporates Vader chrome exterior bits, 20-inch Ultra-bright wheels, and an Alpine Umber interior.
As for the greasy bits under the hood, the refreshed 2024 GMC Sierra HD is equipped as standard with the naturally aspirated 6.6L V8 L8T gasoline engine, which is rated at 401 horsepower and 464 pound-feet of torque, connecting to the Allison-branded 10-speed automatic transmission rather than the GM six-speed automatic equipped by gasoline-fueled Sierra HD models prior to the refresh.
The 6.6L V8 L5P turbodiesel Duramax engine is once again offered as optional, with output uprated to 470 horsepower and 975 pound-feet of torque, versus 445 horsepower and 910 pound-feet of torque prior to the refresh. The L5P also connects to the Allison-branded 10-speed automatic transmission.
Under the skin, the 2024 GMC Sierra HD rides on the more-capable variant of the GM T1 platform. Production will kick off next month at the GM Flint plant in Michigan. The new Sierra HD AT4X is set to launch later in the 2023 calendar year.