FHB ✓ Factory-verified

Buick · Regular Production Option

Axle, 3.47 final drive ratio

Years 2025–27 Models 1 Factory citations 3

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Also documented for CadillacChevroletGMC

Documented applications

Envision — E2XX (2021–2027) →

• 2025–2027 ✓ Factory-verified

  2027: all trims: S

  ⛭ GM factory document — 2025 buick envision fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 buick envision fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 buick envision fleet order guide, p.7.

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