4SG Factory-verified

GMC · Regular Production Option

Trim group, AT4 Ultimate

Years 2023–27 Models 6 Factory citations 22

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Also described as Trim group, Canyon AT4, 4WDTrim group, AT4XTrim group, AT4 option 2

Documented applications

Canyon — Third generation (VSS-T) (2023–2027)

2023–2027 Factory-verified

GM fleet model T4E43; shown in the trim headings of the guides; the upfitter lists name it package AT4 option 2

GM factory document — 2023 gmc 23canyon electrical body builder 2023march13, p.9.
GM factory document — 2024 gmc 24 canyon electrical body builder manual 2023oct04, p.9.
GM factory document — 2025 gmc canyon fleet order guide, p.1.
GM factory document — 2026 gmc canyon fleet order guide, p.1.
GM factory document — 2027 gmc canyon fleet order guide, p.1.

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

only in: 4WD Crew Cab TK15543

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.1.

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

only in: 2500 HD; NICB 2026 lists the AT4X as a 2500 4WD series only

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1.

Sierra — T1XX (2019–2026)

2023–2026 Factory-verified

the 2025 and 2026 guides head this column AT4X

GM factory document — 2023 gmc 23 sierra 1500 electrical body builder sm en us 2022oct12, p.9.
GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.10.
GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.8.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide, p.168, p.169.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide, p.85, p.86.

Yukon — T1XX (2021–2027)

2025–2027 Factory-verified

the 2026 body-builder list names it AT4 option 2

GM factory document — 2025 gmc new yukon denali fleet order guide, p.1.
GM factory document — 2026 gmc yukon denali fleet order guide, p.1.
GM factory document — 2027 gmc yukon fleet order guide, p.1.
GM factory document — 2026 gmc yukon yukon xl electrical body builder manual service manual 2026 en us, p.4.

Yukon XL — T1XX (2021–2027)

2025–2027 Factory-verified

the 2026 body-builder list names it AT4 option 2

GM factory document — 2025 gmc new yukon xl denali fleet order guide, p.1.
GM factory document — 2026 gmc yukon xl denali fleet order guide, p.1.
GM factory document — 2027 gmc yukon xl fleet order guide, p.1.
GM factory document — 2026 gmc yukon yukon xl electrical body builder manual service manual 2026 en us, p.4.

This page aggregates every documented appearance of 4SG in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.