| Also known as | T4384 |
| Diagram | Fig. 11 — GEARBOX SHAFTS AND GEARS · ref 13 |
| Subsystem | gearbox |
| Listed in parts books | 1971–1974 |
GEAR,USED LS 4TH EARLY 5 SPEED (Shown up till 76) Use 57-4787 for late 5 speed
Layshaft fourth gear for the early Triumph five-speed gearbox, used up to 1976; later boxes need 57-4787 instead.
57-4384 is a fourth gear from the layshaft of the early five-speed gearbox, the kind fitted up through 1976 before Triumph revised the cluster. The catalog notes this is the version to use for the early box only — if you're working on a later five-speed you want 57-4787 instead, since the gear geometry changed between the two.
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This one lives inside the gearbox shell on the layshaft, meshing with its mating gear on the mainshaft to give you fourth. If you're rebuilding a layshaft cluster or chasing a worn or chipped tooth, this is the part number to check against what's actually in your case before you order, since early and late five-speed internals aren't interchangeable.
Our records show this PN turning up in gearbox shafts and gears figures across catalog listings dated 1973-1974, consistent with the early five-speed layout. Worth double-checking your gearbox casing and shaft configuration against the parts book before ordering, since the wrong generation gear won't mesh right even though it looks similar.
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