This is such a bad idea, silicone caulk in your gear oil? silicone caulk uses an acidic acid base, it will eat away at the soft copper based metals that are used in the bushings on your syncros and in other places in your tranny, it will completely destroy those metals.
If you have old noisy gears the best thing to do is get the gear box rebuilt or replaced, if you want to make it limp along a few years longer you can put thicker gear oil in, or you can add a thickener that is designed for gear oil, something like Lucus Oil conditioner.
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