| Also known as | T3862 |
| Diagram | Fig. 10 — GEARBOX SHAFTS AND GEARS · ref 9 |
| Subsystem | gearbox |
| Listed in parts books | 1969–1972 |
Layshaft Low Gear (30T)
Layshaft low (first) gear, 30 tooth, for the unit-construction Triumph gearbox.
57-3862 is the layshaft low gear out of the gearbox, listed in the parts books as a 30-tooth gear. It's one of the pair on the layshaft that gives you first gear, meshing with its corresponding mainshaft gear to set that lowest ratio. The older part number for this one is T3862, so if you're working from an early parts book or matching up a used box, that's the number to cross with.
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This one lives inside the gearbox shell with the rest of the shaft and gear cluster, and it shows up across catalog listings from 1969 through 1972. If you're rebuilding a box and this gear is chipped, worn on the dogs, or making noise in first, it's a straightforward swap alongside the rest of the shaft set - just make sure the mating gear and bushings are checked at the same time since they wear as a set.
When you're ordering, have your gearbox casing or parts book number handy so we can confirm this is the right 30T low gear for what you've got apart on the bench.
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