| Also known as | T2528 |
| Diagram | Fig. 8 — GEARBOX SHAFTS AND GEARS · ref 3 |
| Subsystem | gearbox |
| Listed in parts books | 1970 |
Mainshaft High Gear (24T)
Mainshaft high gear (24 tooth) for the 1970 gearbox cluster, also listed under the older T2528 number.
57-2528 is the mainshaft high gear, 24 tooth, out of the gearbox shafts and gears group. It's one of the gear pairs that ride on the mainshaft inside the gearbox shell, and it's what the box selects into for top gear. The catalog shows this one appearing for the 1970 model year, and it also carries the older T2528 part number if you're working from a pre-unit-style parts book listing.
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Grounding notes from other catalog listings tag this as a close-ratio gear, so if you're rebuilding a box and comparing gear sets, don't just match tooth count — make sure you know whether the rest of your cluster is standard or close ratio before you bolt this one in.
Gearbox internals like this are matched sets. If you're pulling one gear because of wear or chipped teeth, it's worth having the whole shaft and its mating gears out on the bench so you can check them together rather than swapping just the one piece and hoping.
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