The fully refreshed GMC Sierra HD is set to launch for the 2024 model year as opposed to the 2023 model year, GM Authority has learned. Previously, it was unclear if the GMC Sierra HD refresh would launch for the 2023 model year or 2024 model year, but now, according to GM Authority sources, the 2024 model year is the target.
The introduction of the refreshed GMC Sierra HD for the 2024 model year arrives after the introduction of the refreshed GMC Sierra 1500 for the 2022 model year, the latter of which broke cover in October of 2021 to replace the the pre-refresh 2022 GMC Sierra 1500 Limited with a long list of changes and updates.
With regard to the refreshed 2024 GMC Sierra HD, updates will start with a new exterior, with revisions to both the front and rear end, as previewed by a selection of prototype models covered by GM Authority in the past. The lighting up front and in the rear will both be new.
The refreshed 2024 GMC Sierra HD will include revisions to the cabin space as well, once again as previewed by past GM Authority coverage. Standout updates in the cabin will include a center stack that’s similar (if not identical) to that of the refreshed 2022 GMC Sierra 1500, with a 13.4-inch infotainment screen on deck, mounted above a horizontal hard-button arrangement.
Also of note for the refreshed 2024 GMC Sierra HD is the introduction of the new Sierra HD AT4X model, as first reported by GM Authority earlier in March. As one would expect given the name, the Sierra HD AT4X will slot in above the “regular” GMC Sierra HD AT4 as an even-more capable off-roader trim level.
As for the goodies under the hood, the refreshed 2024 GMC Sierra HD will replace the GM six-speed automatic transmission with the newer 10-speed for units equipped with the naturally aspirated 6.6L V8 L8T gasoline engine, while the 6.6L V8 L5D turbodiesel Duramax will get a boost in output to 1,100 pound-feet of torque and more than 500 horsepower.
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Comments
I wonder if the L8T gasoline trucks will get the Allison 10 speed.
It won’t get the Allison. The Allison has massive internals to handle 1000lbs of torque, and that beefing up increases weight and friction. It 90% likely will offer the 6 speed in the WT for railroad companies who want to save 100$ over a 10 speed for some reason and the LT trims up will get the 10l90 out of everything else. The 10l90 was track verified with the camaro ZL1 with 650 ftlbs of torque, so it’s ample string for the L8T.
I know many here will disagree on my next statement, but I’d also like to see DFM added to the L8T. Enough AFM engine are finnaly being rebuilt at the end of their life and the deactivated cylinders show significantly less wear all the way back to the cam.
Yes but only if you get a High Country!
I wonder if the HD AT4X will be the first 6 figure mainstream truck ever.
Not with 5-7% interest rates.
Demand is already collapsing and we haven’t even been 3 months into this rising interest rate environment.
People will continue to borrow until there eyeballs pop. It’s about looking good for the neighbors and social media .
I don’t think it will make a difference to sails cause the price of all trucks are just getting to expensive..I always has fully loaded diesels but I am now buying a mid grade 1500 so I can afford it..same thing is happening from alot of people I know..vehicle pricing is just getting to out of hand especially here in canada.