| Also known as | T1870 |
| Diagram | Fig. 8 — GEARBOX OUTER COVER AND LEVERS · ref 1 |
| Subsystem | gearbox |
| Listed in parts books | 1964–1968 |
Gearbox Outer Cover
Outer cover for the gearbox, catalog number 57-1870 (formerly T1870), from the gearbox outer cover and levers section of the parts book.
This is the outer cover for the gearbox, listed in the parts books as 57-1870, with the earlier catalog number T1870 for the same piece. It's the cover plate that closes off the outside face of the gearbox shell, and it shows up in the parts-book section covering the gearbox outer cover and the gear-change levers that mount to or pass through it.
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Our catalog record doesn't tie this cover to a specific model or engine size, and we're not going to guess at that here. What we can say is that it appears across a run of catalog years from the mid-to-late 1960s, and one other reference we've seen lists this same number against 350 and 500 machines - so if you're sorting parts for a smaller-displacement Triumph twin from that era, this is worth checking against your gearbox casing.
If you're not sure this is the right cover for your box, give us a call before you order. Gearbox covers vary enough between years and models that matching against your actual casing is the safest way to confirm fitment.
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