| Diagram | Fig. 12 — GEARBOX SHAFTS AND GEARS · ref 3 |
| Subsystem | gearbox |
| Listed in parts books | 1974, 1976–1977 |
| Also fits (as replacement) | 1974, 1978–1980, 1983, 1985 · for 57-4779 |
HIGH GEAR W/BEARING,UK
Mainshaft high gear with integral bearing for the five-speed gearbox, factory number 57-4781.
This is the high gear (mainshaft top gear) with its bearing, out of the five-speed gearbox internals. The catalog places it in the gearbox shafts and gears figure for the five-speed cluster, so it's a mainshaft component that lives inside the gearbox shell along with the other shafts and pinions.
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The part comes fitted with its own bearing rather than being sold as a bare gear, which is worth noting when you're pricing out a rebuild - you're not sourcing the bearing separately for this one. Our records show this number superseded an earlier part, 57-4779, so if your parts book or an old invoice lists that number, it's the same physical component under its prior factory number.
Catalog appearances for this one are limited to a single year, 1974, in our records. If you're matching this against a different model or year gearbox, check the gear cluster and shaft dimensions against what's actually in the case before ordering, and give us a call if you want to talk through fitment.
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