| Also known as | T440 |
| Diagram | Fig. 8 — GEARBOX SHAFTS AND GEARS · ref 22 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962, 1964–1965, 1967–1968, 1970–1971 |
Gearbox sprocket nut
Gearbox sprocket nut that secures the sprocket on the gearbox mainshaft, also known by its older T440 book number.
The 57-0440 is the gearbox sprocket nut, the nut that secures the sprocket on the gearbox mainshaft. It shows up in the parts book under the GEARBOX SHAFTS AND GEARS figure, and older catalogs list it under the T440 number if that's what's printed in your book.
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This one lives at the business end of the gearbox where the final drive sprocket sits, so it takes the load of holding that sprocket in place while the box is turning. Catalog records show it appearing across a run of gearbox listings from 1960 into 1971, so it's a part that stayed in the lineup for a good while.
When you're in there for a sprocket swap or a chain job that requires pulling the sprocket, this is the nut you'll be dealing with. Worth having a fresh one on hand rather than reusing a tired one if it's shown any wear.
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