| Also known as | T955 |
| Diagram | Fig. 8 — GEARBOX SHAFTS AND GEARS · ref 6 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962, 1967–1968, 1970 |
Mainshaft 2nd gear (21T)
Mainshaft second gear, 21-tooth, for the gearbox shafts and gears assembly.
57-0955 is the mainshaft second gear, a 21-tooth gear that lives on the mainshaft inside the gearbox. It's one of the gear pairs that sets ratios as you work the gearbox, and it shows up in the catalog under the older T955 designation as well, so if your parts book lists T955 that's this same gear.
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This one appears in the gearbox shafts and gears figure across catalog entries running from 1960 to 1970, so it's been in the parts books a good while under that number before and after any renumbering. Given the tooth count is called out specifically as 21T, make sure whatever gear you're replacing matches that count before you order.
If you're rebuilding a gearbox and pulling shafts apart, it's worth checking the mating gears and bushings while you're in there rather than just swapping this one piece and buttoning it back up.
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