QDR ◑ Single-source

Chevrolet · Regular Production Option

GR78-15 radial whitewall

Years 1963–79 Models 1

Documented applications

Impala / Full-Size →

• 1963–70s (varies) ◑ Single-source

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