| Also known as | T1778 |
| Diagram | Fig. 7 — GEARBOX INNER COVER AND SELECTORS · ref 20 |
| Subsystem | gearbox |
| Listed in parts books | 1964–1965, 1967–1968 |
BOLT,GBOX CVR 5/16BSW - 1 1/8
5/16 BSW, 1 1/8 inch bolt for the gearbox inner cover, also known as T1778 or 9998-409.
57-1778 is a gearbox cover bolt, 5/16 BSW thread, 1 1/8 inch long. It shows up in the parts book under the GEARBOX INNER COVER AND SELECTORS figure, so this is one of the fasteners holding the inner cover onto the gearbox shell. The old-book form of this number is T1778, and it's also carried as 9998-409, so if your parts book or a bag of spares shows either of those, it's the same bolt.
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Our only catalog reference for this one is a single listing tied to 1965, so treat that as what we can confirm rather than a broader fitment claim. If you're rebuilding an inner cover assembly and need to match thread and length, this is the one to check against.
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