With the upcoming mid-cycle refresh of the GMC Sierra HD lineup, select trims of the 2024 Sierra HD received a substantial interior furnishing upgrade. Recently, we found out that this interior overhaul was more than just a simple cut-and-paste from the light-duty Sierra 1500, and required some extra massaging in order to make everything lineup properly.
First off, it’s important to note that the cabs of the current-generation Sierra LD and Sierra HD are completely different from each other, and only share the roof. Some of the key differences for 2020 and newer trucks, including the 2024 model-year refresh, involve the seemingly mundane, like the doors and windows.
“The doors and beltline is a key difference,” a GM interior designer told Alex Luft, GM Authority Executive Editor, during a recent GM truck media event. “Because we’re sitting higher in an HD, the belt line is about 25 mm [0.8 inches] lower than in the Light Duty.” This means that the windows are taller in the HD than they are in the LD in order to achieve better outward visibility from within the cabin.
As a reminder, the 2024 Sierra HD received a complete refresh, boasting a revised exterior with an updated front fascia, as well as the aforementioned overhauled interior. Engine options include the standard naturally aspirated 6.6L L8T V8 gasoline engine, rated at 401 horsepower and 464 pound-feet of torque, while the 6.6L V8 L5P turbodiesel Duramax engine, now rated at 470 horsepower and 975 pound-feet, up from 445 horses and 910 pound-feet of torque, is optional on all trim levels except the Denali Ultimate, which equips it as standard.
No matter the engine choice, every 2024 GMC Sierra HD features the Allison-branded 10-speed automatic transmission as standard, which replaces the GM six-speed equipped by gasoline-powered models prior to the refresh.
GM Authority exclusively uncovered pricing details for the refreshed Sierra HD earlier this month, while production is scheduled to start in February.