GMC Sierra 2500 HD (4th gen T1, 2020–2025) — choose year
GMC Sierra 2500 HD 4th gen T1 — choose a year for specs, official downloads, and everyday maintenance how-tos.
2020
2020 GMC Sierra 2500 HD (4th gen T1) — your manual, maintenance jobs, and shopping shortcuts.
2021
2021 GMC Sierra 2500 HD (4th gen T1) — your manual, maintenance jobs, and shopping shortcuts.
2022
2022 GMC Sierra 2500 HD (4th gen T1) — your manual, maintenance jobs, and shopping shortcuts.
2023
2023 GMC Sierra 2500 HD (4th gen T1) — your manual, maintenance jobs, and shopping shortcuts.
2024
2024 GMC Sierra 2500 HD (4th gen T1) — your manual, maintenance jobs, and shopping shortcuts.
2025
2025 GMC Sierra 2500 HD (4th gen T1) — your manual, maintenance jobs, and shopping shortcuts.