| Also known as | T1912 |
| Diagram | Fig. 8 — GEARBOX SHAFTS AND GEARS · ref 3 |
| Subsystem | gearbox |
| Listed in parts books | 1967–1968 |
Mainshaft High Gear (28T)
Mainshaft high gear, 28 tooth, from the gearbox shafts and gears assembly.
This is the mainshaft high gear, cut with 28 teeth, out of the gearbox shafts and gears assembly. In the catalogs it's listed as 57-1912, with the older-style number T1912 marking the same part for shops still working from that numbering.
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This gear rides on the mainshaft inside the gearbox and is part of what gives the box its top ratio when engaged. It's a mesh part, so wear on the teeth affects how clean the gearbox shifts and holds in top gear.
Our catalog record on this one is thin - it shows up in a couple of listings tied to the mid-to-late 1960s window, but we don't have more detail beyond that. If you're matching this against a rebuild, confirm tooth count and fit against your existing shaft before ordering.
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