X31 off-road and protection package

Years 2025–27 Models 2 Factory citations 8

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Also described as X31 Off-Road and Protection Package

Documented applications

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

only in: 2500 HD and 3500 HD pickup; includes off-road suspension with twin-tube Rancho shocks (X31), hill descent control (JHD), skid plates (NZZ), spray-on bedliner (CGN), LPO all-weather floor liners (RIA) and X31 badge; SLE, SLT: O; Pro, AT4, AT4X, Denali, Denali Ultimate: not offered

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 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.29.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.26.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.27.

Sierra — T1XX (2019–2026)

2025–2026 Factory-verified

GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

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