| Diagram | GEARBOX SHAFTS, BEARINGS AND INNER COVER |
| Subsystem | gearbox |
| Listed in parts books | Not catalogued by year yet |
Mainshaft High Gear (23T)
Mainshaft high gear (23T) for the gearbox, part number 12534.
This is the mainshaft high gear from the gearbox, a 23-tooth pinion that rides on the mainshaft and engages as part of the top-gear drive train. The catalog places it squarely in the gearbox internals, alongside the shafts, bearings, and inner cover.
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The manufacturer tag on file says Lucas, but that is not right for a gear like this — Lucas made electrics, not gearbox internals, so treat that tag as an error in our records rather than a fact about who made the part.
Our catalog record only shows this part turning up once, tied to 1969. If you are rebuilding a box and need to confirm this gear matches what is in front of you, give us a call and we will work through the fitment before you order.
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