B3 ● Confirmed

Buick · Regular Production Option

4-speed manual floor shift (RPO M20/M21)

Years 1970 Models 1

Documented applications

Skylark / GS →

• 1970 ● Confirmed

  GS, GS 455

This page aggregates every documented appearance of B3 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.