| Also known as | T4161 |
| Diagram | Fig. 10 — GEARBOX SHAFTS AND GEARS · ref 6 |
| Subsystem | gearbox |
| Listed in parts books | 1971 |
Mainshaft 2nd gear (19T)
Mainshaft second gear (19 tooth) for the Triumph gearbox cluster, catalog number 57-4161.
This is a mainshaft second gear, 19 tooth, out of the gearbox internals. It's one of the gear pairs that live on the mainshaft inside the gearbox shell, part of the cluster that gives you second gear when the selector forks and dogs line it up. The catalog carries it under 57-4161, with T4161 as the older-style number for the same piece.
Read more
It shows up in the gearbox shafts and gears figure, which is where you'd expect to find it alongside the rest of the shaft and gear cluster. Our record on it only ties it to a single catalog year, so beyond knowing it's a Triumph gearbox internal, we don't have more detail on which specific models it was fitted to across the range.
If you're rebuilding a box and pulling the mainshaft apart, it's worth checking the dogs and bushing surface on the old gear before you decide whether to replace it. Call the shop and we'll confirm fitment before you order.
Sorry if we got something wrong here. If you think this information isn't correct, .