GMC Sierra 2500 HD (4th gen T1, 2020–2025) — choose year
GMC Sierra 2500 HD 4th gen T1 — select a year for factory specs, brake and fluid guides, and upgrade-friendly maintenance references.
2020
2020 GMC Sierra 2500 HD (4th gen T1) — manual downloads and performance-minded service guides.
2021
2021 GMC Sierra 2500 HD (4th gen T1) — manual downloads and performance-minded service guides.
2022
2022 GMC Sierra 2500 HD (4th gen T1) — manual downloads and performance-minded service guides.
2023
2023 GMC Sierra 2500 HD (4th gen T1) — manual downloads and performance-minded service guides.
2024
2024 GMC Sierra 2500 HD (4th gen T1) — manual downloads and performance-minded service guides.
2025
2025 GMC Sierra 2500 HD (4th gen T1) — manual downloads and performance-minded service guides.