| Also known as | T4346 |
| Diagram | Fig. 11 — GEARBOX SHAFTS AND GEARS · ref 4 |
| Subsystem | gearbox |
| Listed in parts books | 1971–1972 |
GEAR Mainshaft high 25t std 3 cyl
25 tooth mainshaft high gear for the three cylinder Triumph gearbox.
This is the mainshaft high gear for the three cylinder gearbox, a 25 tooth gear that lives on the mainshaft inside the transmission. It's part of the gear cluster that gives the box its top ratio, meshing with its corresponding layshaft gear to send drive through on the highest gear.
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Because it's a mainshaft component, getting into it means splitting the gearbox and pulling the shaft cluster out, not a job you do on a whim. If you're in there for wear or noise complaints on the triple gearbox, this is one of the parts worth checking closely along with its mating gear.
We don't have much more on file for this one beyond the basic description, so if you're ordering to fix a specific fault, it's worth double checking tooth count and shaft fit against what's actually in your box before you commit.
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