| Also known as | T1604 |
| Diagram | Fig. 9 — GEARBOX SELECTOR MECHANISM · ref 7 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962, 1968, 1970 |
Strong index plunger spring
Heavy-duty index plunger spring for the gearbox selector mechanism, part 57-1604 (also T1604).
This is the strong index plunger spring for the gearbox selector mechanism, part number 57-1604, also known under the older T1604 designation. It shows up in the parts books under both the GEARBOX SELECTOR MECHANISM and GEARBOX INNER COVER AND SELECTORS figures, so it lives inside the gearbox where the selector plunger does its work holding each gear position steady.
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The plunger and its spring are what give the gearchange that positive, detented feel between gears rather than letting the selector drift or float between positions. This one's called out as the "strong" version, so it's built to give more resistance than a standard plunger spring would.
Our catalog record spans appearances from 1960 through 1970 but doesn't pin this to one specific model, so if you're chasing an exact fitment for your machine, give us a call and we'll confirm before you order.
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