| Also known as | T914 |
| Diagram | Fig. 8 — GEARBOX SHAFTS AND GEARS · ref 1 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962, 1964–1965, 1967 |
MAINSHAFT c/w LOW GEAR
Gearbox mainshaft assembly with low gear fitted, cataloged 1960–1967 and later superseded by 57-2436.
This is a gearbox mainshaft with the low gear installed as an assembly, listed in the catalog under GEARBOX SHAFTS AND GEARS. Older parts books show it as T914, which is the pre-1973-style number for the same physical piece now carried as 57-0914. The mainshaft is one of the two main rotating shafts inside the gearbox case, and the low gear on it is part of how the transmission gets its ratios sorted out between the mainshaft and the layshaft.
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Our catalog appearances for this part run from 1960 through 1967, so it belongs to that earlier era of the gearbox family rather than the later boxes. Triumph superseded this part with 57-2436, so if you're working from a later parts book or sourcing a replacement, that's the number you'll find it under now — same shaft-and-gear assembly, just renumbered down the line.
If you're rebuilding a gearbox and pull this shaft, check the low gear teeth and the shaft bearing surfaces for wear before deciding whether to reuse it. Given the supersession, double check which number matches your parts book before ordering so you get the right listing.
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