GU4 ● Confirmed

Buick · Regular Production Option

Axle, rear, 3.08 ratio

Years 1987 Models 1

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Also documented for CadillacChevroletGMCOldsmobilePontiac

Documented applications

Regal — G-body (1983–1987) →

• 1987 ● Confirmed

  no-charge option; gnttype.org's 1987 option sheet

This page aggregates every documented appearance of GU4 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.