Muncie (GM)

Muncie (GM) M21

From the Gearbox Wiki, the reference for people who still shift their own.

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Muncie (GM) M21 is a manual gearbox from Muncie (GM).

Buick

Vehicle	Years	Shift pattern	Gearbox source	Members
Buick Apollo / Skylark X-body 4-speed M21 / M22 manual ^[1] Applies to: 1975-1979 infobox	1975-1979	4 speed, reverse top left	Corroborated

Vehicle	Years	Shift pattern	Gearbox source	Members
Pontiac Grand Prix 2nd gen 389 V8, 4-speed manual ^[2] Applies to: 1965	1965	4 speed, reverse top left	Corroborated

Wikipedia. Wikipedia infobox lists 4-speed M-21 and M-22 manuals. [link]
Wikipedia. Wikipedia: 3- and 4-speed carried over from 1964; 1964 four-speed was the Muncie M-20 or M-21. [link]

Categories: Gearboxes | Muncie (GM)

This page was last edited on November 11, 2026. Gearbox codes change by year, engine and market. Send a correction.