Reference Details
- Availability
- optional
- Category
- performance
- Code
- M20/M21
- Confidence
- documented
- Notes
- Option-code reference lists 4-speed manual variants; Hemmings reports a floor-shifted four-speed choice for A1/A9 GS buyers.
Option reference
M20/M21 4-speed manual transmission
performance · optional
Cars With This Option
1 linked car page.
1972 Buick
1972 Buick GS Stage 1
Factory GS Stage 1 performance configuration