GVWR, 11,500 lbs (5216 kg), single rear wheels

Years 2014–15, 2019, 2025–27 Models 3 Factory citations 6

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Also described as GVWR, 11,500 lbs (5216 kg)

Also documented for Chevrolet

Documented applications

Sierra HD — GMT900 (2007–2014)

2014 Factory-verified

only in: 3500; diesel

GM factory document — 2014 gmc sierra 3500hd fleet order guide wayback, p.4.

Sierra HD — K2XX (2015–2019)

2015, 2019 Factory-verified

only in: 3500HD; 2015 marks: Sierra, SLE, SLT: O; 2019: GM's 2019 Sierra 3500HD order guide

GM factory document — 2015 gmc sierra 3500hd fleet order guide wayback, p.4.
GM factory document — 2019 gmc sierra 3500hd order guide copy gm authority, p.25.

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of G1Y in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.