| Also known as | T3661 |
| Diagram | Fig. 8 — GEARBOX SHAFTS, BEARINGS AND INNER COVER · ref 21 |
| Subsystem | gearbox |
| Listed in parts books | 1969–1970, 1974 |
Index plunger spring
Spring for the camplate index plunger in the gearbox inner cover, part number 57-3661.
This is the small spring behind the camplate index plunger in the gearbox, part number 57-3661 (also seen in older parts books as T3661). It lives inside the inner cover assembly, where the plate that selects your gear positions gets located by a spring-loaded plunger. Without this spring holding tension on that plunger, the camplate won't seat properly into each gear position and shifting gets sloppy or indistinct.
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The catalog shows this spring on gearbox inner cover pages, tied to the shaft and bearing assembly. It's a cheap insurance item to have on hand if you're already in there doing selector work, since it's a small part that's easy to overlook once everything else has been cleaned and reassembled.
If you're rebuilding a four-speed box and things feel vague between gears, this spring along with the plunger itself is worth checking before you start chasing bigger problems elsewhere in the selector mechanism.
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