| Also known as | 57 3660, T3660 |
| Diagram | Fig. 8 — GEARBOX SHAFTS, BEARINGS AND INNER COVER · ref 20 |
| Subsystem | gearbox |
| Listed in parts books | 1969–1970, 1973–1974 |
Index plunger
Gearbox camplate index plunger that holds gear selections in place inside the inner cover.
The 57-3660 index plunger is a small but important piece inside the gearbox, living behind the inner cover along with the shafts, bearings, and selector mechanism. Its job is to press against the camplate and hold each gear selection in position once the shift has been made, so the box doesn't wander out of gear on its own.
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This part shows up across gearbox inner cover and selector mechanism figures in the catalog spanning 1969 to 1974, and it carries the older T3660 designation for shops working from earlier parts books. It's a wear item that's easy to overlook until shifting starts feeling vague or gears start slipping out on their own.
If you're chasing a gearbox that won't stay in gear or pops out under load, this plunger and its spring are worth checking along with the camplate itself. Confirm fitment against your gearbox internals before ordering, since the catalog record doesn't spell out every application here.
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