M-21 ◑ Single-source

Oldsmobile · Regular Production Option

Close-ratio 4-speed

Years 1973 Models 1

Documented applications

Cutlass / 4-4-2 →

• 1973 ◑ Single-source

  Listed in 1973 442 FAQ data

This page aggregates every documented appearance of M-21 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.