| Also known as | T4377 |
| Diagram | Fig. 11 — GEARBOX SHAFTS AND GEARS · ref 9 |
| Subsystem | gearbox |
| Listed in parts books | 1971–1974, 1976–1980, 1983, 1985 |
MAINSHAFT 3rd GEAR c/w bush
Mainshaft 3rd gear with bush for the Triumph 5-speed gearbox, part 57-4377 (aka T4377).
57-4377 is the mainshaft 3rd gear, supplied complete with its bush, for the 5-speed Triumph gearbox. It shows up across the gearbox shafts and gears figures, including the specific listing for the 5-speed box fitted to the T150V, and it's also called out among the parts needed to build up the optional 5-speed gearbox setup.
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This gear rides on the mainshaft and works with its matching pair on the layshaft to give you 3rd gear. Because it comes through with the bush included, you're not hunting down a separate bush to go with it when the old one's worn or scored.
The legacy book number for this one is T4377, so if you're working from an older parts list that's the number you'll see instead of 57-4377. Appears across catalog listings from 1971 into the mid-80s, but check your own parts book or give us a call to confirm it's the right one for your gearbox before ordering.
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