| Also known as | T4344 |
| Diagram | Fig. 4 — GEAR CLUSTERS AND TIMING COVERS · ref 1 |
| Subsystem | engine bottom |
| Listed in parts books | 1971 |
MAINSHAFT COMPLETE WITH BUSH
Gearbox mainshaft assembly complete with bush, Triumph part 57-4344 (also T4344).
This is the mainshaft assembly listed as complete with bush, part number 57-4344, also found in older parts books under T4344. It shows up in the gear cluster and timing cover section of the parts catalog, which puts it inside the gearbox where the mainshaft carries the gear cluster and passes power through to the output side.
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Because it's listed "complete with bush," this one comes with its bush already fitted rather than as a bare shaft, which is worth noting if you're comparing against other mainshaft listings that are sold bare. Our catalog record ties this to appearances in 1971, but we'd confirm exact gearbox fitment against your casing and cluster before ordering.
If you're rebuilding a gearbox and pulling the old mainshaft, check the wear on the bush and the gear train it locates before assuming this one is a straight swap - gearbox internals from this era can vary enough between casings that it pays to double check.
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