M29 / M38 / M40 ◑ Single-source

Buick · Regular Production Option

THM-200 / THM-350 / THM-400

Years 1975–77 Models 1

Documented applications

Regal / Century →

• 1975–1977 ◑ Single-source

  Century, Regal

This page aggregates every documented appearance of M29 / M38 / M40 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.