M40 ● Confirmed

Buick · Regular Production Option

Turbo Hydra-Matic 400

Years 1971–76 Models 2

Documented applications

Full-Size — LeSabre / Electra / Wildcat →

• 1971–1976 ● Confirmed

  Full-size

Regal / Century →

• 1973–1974 ● Confirmed

  Century GS 455

This page aggregates every documented appearance of M40 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.