| Also known as | T4387 |
| Diagram | Fig. 12 — GEARBOX SHAFTS AND GEARS—T150V (5 SPEED) · ref 20 |
| Subsystem | gearbox |
| Listed in parts books | 1971–1972 |
GEAR,L/S 3RD EARLY 5 SPEED
Layshaft third gear for the early Triumph 5-speed gearbox, part number 57-4387.
This is the layshaft third gear for the early version of Triumph's optional 5-speed gearbox, part number 57-4387 (also listed as T4387 in older parts books). It shows up in the gearbox shafts and gears figures for the T150V 5-speed setup, and in the listing for the optional 5-speed gearbox parts.
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Third gear sits on the layshaft (the "L/S" in the description) and meshes with its mating gear on the mainshaft to give you third ratio. This is the early production version of the gear, so if you're rebuilding a 5-speed box, check what you're pulling out against this part before ordering — gearbox internals changed across the run and early versus later gears aren't always interchangeable.
Our catalog record ties this one to 1971-72. If your box doesn't match that window, give us a call before you order so we can confirm you're getting the right version.
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