| Also known as | T407 |
| Diagram | Fig. 13 — GEARBOX OUTER COVER · ref 12 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962, 1965, 1967–1974, 1976–1980, 1983, 1985 |
Guide plate
Guide plate for the gearchange/selector mechanism on Triumph unit-construction twins, also known by its older T407 part number.
57-0407 is the guide plate used in the gearchange and selector mechanism on Triumph unit-construction twins. It's a small steel plate that guides the quadrant/selector motion as you work the gear lever, keeping the shift arm tracking correctly through its arc inside the gearbox outer cover area. Older parts books list this same piece under the T407 number, so if you're working from a vintage catalog or an old parts list, that's the same physical part.
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This one shows up across a long run of gearbox outer cover, gearchange/kickstart crank, and selector mechanism figures, which tells you it's a mechanism-level piece rather than something buried deep in the gearbox internals - it lives where the external shift linkage does its work. It's a long-running part in Triumph's catalog, appearing across decades of production.
If you're rebuilding a selector mechanism or chasing sloppy, imprecise gearchange feel, this plate is worth inspecting - wear here can show up as vague or inconsistent shifting. Confirm which gearbox cover and selector components you're working with before ordering, since the mechanism went through changes over the years.
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