| Also known as | T1947 |
| Diagram | Fig. 7 — GEARBOX SHAFTS, BEARINGS AND INNER COVER · ref 9 |
| Subsystem | gearbox |
| Listed in parts books | 1964–1967 |
Mainshaft High Gear (22T)
The 22-tooth mainshaft high gear from the Triumph gearbox, also listed under the earlier T1947 number.
This is the mainshaft high gear, a 22-tooth gear off the mainshaft in the gearbox. Older parts books listed it as T1947 before the shop switched over to the 57-1947 numbering, so if you're working from an older manual and see that T-prefix, it's the same physical part.
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It lives in the gearbox internals, on the mainshaft assembly alongside the other shafts, bearings, and inner cover components in that section of the parts book. Catalog records for this one span 1964 to 1967 across several listings.
Triumph later superseded this part with 57-3991, so if you're sourcing a replacement and your parts book still shows 57-1947 or T1947, know that the currently listed number for the same gear is 57-3991.
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