| Also known as | T4376 |
| Diagram | Fig. 11 — GEARBOX SHAFTS AND GEARS · ref 8 |
| Subsystem | gearbox |
| Listed in parts books | 1971–1974, 1976–1980, 1983, 1985 |
Mainshaft 4th gear
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This is the mainshaft 4th gear for the Triumph gearbox, listed in the catalog as 57-4376 and known under its earlier form as T4376. It shows up in the gears-and-shafts figures for the gearbox, including the five-speed setup used on the T150V and the parts list for the optional 5-speed conversion.
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The mainshaft carries the sliding and fixed gears that pair up with the layshaft to give you your ratios, and 4th gear is one of the pieces riding on that shaft doing the work when you're in that gear. If you're rebuilding a gearbox and finding chipped teeth, excess play, or a gear that won't engage cleanly, this is the part that gets replaced.
Our record ties this one specifically into the five-speed gearbox figures, so double check what you're working with before ordering — four-speed and five-speed internals aren't the same parts, and matching your gearbox type matters more than the year on the frame.
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