Axle, 3.47 final drive ratio

Years 2019, 2025–27 Models 2 Factory citations 4

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Also documented for Buick Cadillac Chevrolet

Documented applications

Terrain — Second generation (D2XX) (2018–2024)

2019 Factory-verified

SL, SLE, SLT: S; only with the LYX engine

GM factory document — 2019 gmc terrain order guide copy gm authority, p.9, p.43.

Terrain — Third generation (2025–2027)

2025–2027 Factory-verified

2025: S: Elevation AWD; not offered: Elevation FWD; 2026: S: Elevation AWD, AT4, Denali; not offered: Elevation FWD; 2027: S on all trims; all-wheel-drive models only in the 2025 and 2026 guides; the 2027 guide marks it standard in all four columns without that note

GM factory document — 2025 gmc next generation terrain fleet order guide, p.4.
GM factory document — 2026 gmc next generation terrain fleet order guide, p.7.
GM factory document — 2027 gmc terrain fleet order guide, p.8.

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