| Also known as | T3889 |
| Diagram | Fig. 10 — GEARBOX SHAFTS AND GEARS · ref 3 |
| Subsystem | gearbox |
| Listed in parts books | 1970–1972 |
Mainshaft third gear (23T)
Mainshaft third gear (23 tooth) for the gearbox, also listed as T3889 in older parts books.
Part number 57-3889 is a mainshaft third gear with 23 teeth, out of the gearbox on the catalog's shafts-and-gears side as well as the inner cover and selectors figure. The older parts books list the same piece as T3889, so if you're working from a vintage manual that's the number you'll see instead.
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This gear rides on the mainshaft inside the gearbox and is one of the pieces that gets selected in and out of engagement when you shift through the box. It appears in the catalog record spanning 1970 to 1972, so check that against your own gearbox before ordering.
If you're rebuilding a gearbox and pulling shafts and selectors apart, it's worth inspecting the dogs and bore on this gear closely, since wear here shows up as trouble finding or holding third.
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