The GMC Sierra Heavy Duty underwent a complete check (redesign and re-engineering) for the 2020 archetypal year. As such, the archetypal has accustomed some accessory changes and updates for 2021, which represents the additional assembly year for the fourth-generation of the nameplate.
See abundant 2021 GMC Sierra HD changes, updates and new appearance here: 2021 GMC Sierra HD change log.
The updates and changes declared actuality are specific to the U.S. bazaar and may alter for added markets.
The 2021 Sierra HD is accessible as a 2500 or 3500 able full-size auto barter archetypal with several cab and box configurations:
The 2021 GMC Sierra HD is offered as a retail or agile model, with the Sierra (1SA) actuality the abject model.
2021 Sierra HD Retail & Agile Models:
2021 Sierra HD Retail & Agile Trims:
The 2021 GMC Sierra HD is offered with the afterward agent and manual choices:
The 2021 Sierra Heavy Duty rides on a added able adaptation of the GM T1 platform that additionally underpins the 2020 Sierra 1500, 2020 Yukon, as able-bodied as added full-size GM trucks and SUVs.
The 2021 Sierra HD is accumulated at the afterward factories:
2021 Sierra HD units should ability banker lots by the end of the third division of 2020.
We apprehend the fourth-generation Sierra HD to remain in production thru the 2026 archetypal year.
An all-new, next GMC Sierra HD will launch after the 2026 archetypal year.
Discuss the 2021 GMC Sierra HD in our GMC forum.
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