GVWR, 13,025 lbs (5908 kg), dual rear wheels

Years 2014–15, 2019 Models 2 Factory citations 3

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Also documented for Chevrolet

Documented applications

Sierra HD — GMT900 (2007–2014)

2014 Factory-verified

only in: 3500

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.

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