| Also known as | T3657 |
| Diagram | Fig. 10 — GEARBOX SHAFTS AND GEARS · ref 3 |
| Subsystem | gearbox |
| Listed in parts books | 1971 |
Mainshaft High Gear (28T)
Mainshaft high gear (28T) for the gearbox internals, also known by its earlier T3657 designation.
57-3657 is a mainshaft high gear from the gearbox internals, carrying 28 teeth. It's one of the gear pairs that ride on the mainshaft inside the gearbox shell, part of what lets the box shift between ratios. In the parts book it shows up under the older T3657 designation as well, so if you're working from an earlier catalog or a box that's been apart before, that's the same piece.
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Our catalog record only ties this one to a single year listing, so we don't have a wide span of model coverage to point to. If you're rebuilding a gearbox and need to match this gear up correctly, it helps to have the rest of the shaft and gear cluster in front of you to check tooth count and fit before you commit to ordering.
Give us a call if you want to confirm this is the right gear for what you're rebuilding — with only one catalog appearance on file for this part, we'd rather double check than guess.
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