| Also known as | T4172 |
| Diagram | Fig. 10 — GEARBOX SHAFTS AND GEARS · ref 3 |
| Subsystem | gearbox |
| Listed in parts books | 1971 |
MAINSHAFT HIGH GEAR (24T)
Mainshaft high gear, 24 tooth, for the gearbox cluster, part number 57-4172 (also T4172).
The 57-4172 is a mainshaft high gear with 24 teeth, listed in the gearbox shafts and gears section of the parts books. It rides on the mainshaft inside the gearbox and is part of the gear cluster that gives top gear drive through the box. In the older parts books this one shows up under the T4172 number, so if you're working from an early catalog or a box of used parts marked that way, it's the same physical piece.
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Our catalog record only ties this one to a single model year, so we can't speak to a broader fitment range beyond what's in that entry. If you're rebuilding a gearbox, check the tooth count and the mating gears against what you've got on the bench before you order, since gear clusters have to match up correctly to work right.
Call the shop if you want us to confirm this is the right gear for your box. We'd rather check than have you pull the gearbox apart twice.
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