British Leyland Single-rail 4-speed is a manual gearbox from British Leyland. The Society has 4 vehicles on file with it, 4 with a source we opened and 0 still leads.
MG
| Vehicle | Years | Shift pattern | Gearbox source | Members |
|---|---|---|---|---|
| MG Midget Midget 1500 (GAN6, Triumph engine) 1493 cc Triumph-engined, 4-speed [1] | 1974-1975 | 4 speed, reverse top right | Corroborated | |
| MG Midget Midget 1500 (Mk IV) 1500 cc, Triumph-engined, 4-speed [2] | 1976 | 4 speed, reverse top right | Corroborated | |
| MG Midget Midget 1500 (Mk IV) 1500 cc, Triumph-engined, 4-speed [3] | 1977-1979 | 4 speed, reverse top right | Corroborated |
Triumph
| Vehicle | Years | Shift pattern | Gearbox source | Members |
|---|---|---|---|---|
| Triumph Spitfire Spitfire 1500 (single-rail box) 1500 cc; overdrive (J-type) and non-overdrive cars [4] | 1975-1980 | 4 speed, reverse top right | Corroborated |
Research notes
Caveats and conflicts (3)
- Wikipedia says Marina, MGOC says Triumph single-rail: both are the same single-rail family (Marina, Toledo, Dolomite, Spitfire 1500). No part code printed. MGOC page: https://www.mgocspares.co.uk/parts/mg/midget/clutch-gearbox-axle/gearbox
- MGOC page: https://www.mgocspares.co.uk/parts/mg/midget/clutch-gearbox-axle/gearbox. No part code printed.
- Row text says forum moderator called it the Marina single-rail box; consistent. Overdrive cars use the J-type Laycock unit per row (not re-verified here).
References
- Retailer. MGOC Spares: 1500 has a 'fully synchromesh four-speed unit' with single-rail selector; Wikipedia: modified Morris Marina gearbox. [link]
- Wikipedia. Wikipedia MG Midget: the 1493 cc Spitfire engine was coupled to a modified Morris Marina gearbox; MGOC Spares parts catalog: "Triumph single-rail gearbox was fitted to the 1500", fully synchromesh on all four gears. [link]
- Wikipedia. Wikipedia MG Midget: the 1493 cc Spitfire engine was coupled to a modified Morris Marina gearbox; MGOC Spares parts catalog: "Triumph single-rail gearbox was fitted to the 1500", fully synchromesh on all four gears. [link]
- Forum. Fast Marina forum: single-rail gearbox casing shared with late Spitfire (Mk4 and 1500), Toledo, Dolomite and Marina; Andy Mace on britishcarforum: 1975 and later 1500 gearbox needs a different clutch driven plate because of 20-spline input. [link]
Categories: Gearboxes | British Leyland
This page was last edited on November 11, 2026. Gearbox codes change by year, engine and market. Send a correction.