| Also known as | T2275 |
| Diagram | Fig. 9 — GEARBOX SHAFTS, BEARINGS AND INNER COVER · ref 11 |
| Subsystem | gearbox |
| Listed in parts books | 1967–1969 |
MAINSHAFT c/w THIRD AND LOW GEARS
Gearbox mainshaft with third and low gears, Triumph part 57-2275, later superseded by 57-4039.
This is the mainshaft assembly for the gearbox, complete with third and low gears, as listed under part number 57-2275 (the earlier catalog form was T2275). It shows up in the parts book under GEARBOX SHAFTS, BEARINGS AND INNER COVER, so it's part of the shaft-and-gear cluster that sits inside the gearbox shell along with the layshaft and inner cover components.
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The mainshaft carries the third and low gear pairs that get selected as you work up and down through the box, so it's a load-bearing piece of the gear train rather than a simple spacer or bush. Catalog listings for this number run from 1967 to 1969, and it's since been superseded by 57-4039 - if your parts book or an older gearbox turns up the newer number, that's the same physical part under Triumph's later numbering.
If you're rebuilding a gearbox and pulling shafts, it's worth checking wear on the gear teeth and the shaft journals where the bearings ride before putting this back in service. Give us a call if you want to confirm what else needs to come out of the box alongside it.
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