BMC

BMC A-series in-sump 4-speed

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

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BMC A-series in-sump 4-speed is a manual gearbox from BMC. The Society has 2 vehicles on file with it, 2 with a source we opened and 0 still leads.

Morris / Austin

Vehicle	Years	Shift pattern	Gearbox source	Members
Morris / Austin Mini (Mini-Minor, Traveller, Van, Pick-up) Mini Mk I-era (driver's handbook AKD3886) 848 cc, remote gear lever ^[1]	Years not confirmed	4 speed, reverse bottom right	Corroborated
Morris / Austin Mini (Mk II, Mk III, Clubman, 1275 GT) Mini Mk II-III era (remote gear lever) 848 / 998 / 1098 / 1275 cc, 4-speed ^[2] Applies to: All (1275 GT close-ratio)	1967-1976	4 speed, reverse bottom right	Corroborated

Research notes

Caveats and conflicts (1)

No gearbox code printed; handbook AKD3886 (row source) not re-read for a code.

References

Wikipedia. Wikipedia Mini: "transverse engine, integrated sump transmission, front-wheel drive" with 4-speed manual. [link]
Wikipedia. Wikipedia Mini: 'Full-four synchromesh gearing was eventually introduced during 1968'; 1275 GT had a close-ratio box. [link]

Categories: Gearboxes | BMC

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