General Motors Timeline: Next-Gen Chevy Silverado HD and GMC Sierra HD Set for 2029
general motors is preparing the next chapter for its heavy-duty pickup lineup, with the next-generation Chevy Silverado HD and GMC Sierra HD now targeted for the 2029 model year. Production is planned to begin in the fourth quarter of 2028, setting up a full redesign for the trucks that have been in their current generation since the 2020 model year. The update is expected to follow the next-gen Chevy Silverado 1500 and GMC Sierra 1500, which are confirmed to arrive for the 2027 model year.
General Motors Sets a 2029 Target
The most important detail is the timing. Sources familiar with the matter say General Motors plans to launch the next-generation Chevy Silverado HD and GMC Sierra HD for the 2029 model year, with production slated to start in the fourth quarter of 2028. That would mark the first full redesign for the heavy-duty Silverado and Sierra since the current generation launched for the 2020 model year.
The sequence matters because it places the heavy-duty trucks directly behind the next-gen light-duty pickups in General Motors’ broader full-size truck refresh. The 1500 models are already confirmed for 2027, making the HD program the next major step in the company’s pickup overhaul.
What the New Trucks Are Expected To Bring
Under the skin, the next-gen Chevy Silverado HD and GMC Sierra HD are expected to use an updated version of the GM T1 platform, identified as T1-2. The HD trucks will use a stronger frame and chassis than the light-duty versions, with improvements focused on capability, durability, and overall refinement.
General Motors is also expected to move the trucks to its next-generation centralized computing platform, replacing the current Global B electrical architecture. That change is intended to support faster processing and more advanced technology, aligning the heavy-duty lineup with the company’s software-defined goals.
The cabin is expected to see a major update as well, with more technology, more expressive materials, and greater comfort and convenience. Planned highlights include new infotainment displays, enhanced connectivity, and more useful towing and hauling technology. The exterior will also be fully redone, with a more modern and expressive design. General Motors is expected to continue offering both gasoline and diesel engine options.
Why the Timing Matters for Truck Buyers
This is not a minor refresh. It is a full redesign cycle that will shape how General Motors competes in the heavy-duty segment for years after launch. The move also signals that the company is keeping a tight sequence across its full-size truck lineup, with the Silverado HD and Sierra HD arriving after the light-duty redesigns.
For buyers watching the market closely, the timeline gives a clear road map: the next-gen Chevy Silverado HD and GMC Sierra HD are still some distance away, but the product plan is now taking shape. General Motors is positioning the trucks for a 2029 debut, and the fourth quarter of 2028 is the production window to watch next.
What’s Next for General Motors
The next development to monitor is whether more details emerge on powertrains, cabin technology, and the final design direction as the launch window gets closer. For now, the key message is simple: general motors has a heavy-duty reset in motion, and the next-gen Chevy Silverado HD and GMC Sierra HD are aimed squarely at 2029.
