Reference Details
- Availability
- optional
- Category
- performance
- Code
- M21
- Confidence
- documented
- Notes
- Four-speed manual documented for GS 455/Stage 1; M21 code listed in Team Buick option-code table.
Option reference
M21 Four-speed manual transmission
performance · optional
Cars With This Option
1 linked car page.
1971 Buick
1971 Buick GS Stage 1
Factory Stage 1 option on 1971 Buick GS/GS 455 records