| Diagram | GEARBOX SHAFTS AND GEARS |
| Subsystem | gearbox |
| Listed in parts books | Not catalogued by year yet |
MAINSHAFT HIGH GEAR
Mainshaft high gear for the gearbox internals, part number 72316.
This is the mainshaft high gear out of the gearbox internals, part number 72316. It lives on the mainshaft inside the gearbox, one of the gear pairs the selectors engage when you change up through the box. The figure it comes from, Gearbox Shafts and Gears, tells us exactly where it sits — this is a shaft gear, not something from the outer cover or the kickstart train.
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Our catalog record only ties it to a single listing from 1969, so we don't have a wide spread of model-year data on this one. If you're rebuilding a gearbox and need to match this gear up, best bet is to have your old part in hand or your parts book open to the same figure so we can confirm it's the right one before it goes in the mail.
The manufacturer tag on file says Lucas, but Lucas made electrics, not gearbox internals — this is a mechanical gear and that tag doesn't hold up against the description. Treat it as a gearbox component, full stop.
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