Heavy-duty rear springs

Years 1966–70 Models 2 Factory citations 1

Also described as HD rear springs

Documented applications

Cutlass / 4-4-2

1969 Factory-verified

Factory optional-equipment list: "Heavy Duty Rear Springs"

GM Heritage factory kit — 1969 Oldsmobile 442 Info Kit, p.247.

Full-Size 88 / 98

1966–70 Confirmed

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This page aggregates every documented appearance of G-51 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.