All Terrain X package

Years 2016–19 Models 2 Factory citations 5

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Documented applications

Sierra HD — K2XX (2015–2019)

2018–2019 Factory-verified

the 2018 guide prints All Terrain X HD Package; 2018: GM's 2018 Sierra 2500HD order guide; 2019: named in the 2019 interior page's package contents or footnotes

GM factory document — 2019 gmc sierra 2500hd fleet order guide wayback, p.1.
GM factory document — 2018 gmc sierra 2500hd order guide copy gm authority, p.19.

Sierra — K2XX (2014–2019)

2016–2018 Factory-verified

new for 2016; only in: 4WD Crew Cab and Double Cab.

GM factory document — 2016 gmc sierra 1500 fleet order guide wayback, p.3.
GM factory document — 2017 chevrolet sierra silverado electrical body builders manual service manual 2017 en us, p.32.
GM factory document — 2018 gmc sierra 1500 order guide copy gm authority, p.91.

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