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With the clutch ENGAGED, especially with the car in neutral,
it is natural to get a little sound out of the tranny.
You have gears turning in oil in there and everything else
in the driveline is fairly quiet. Unless you are riding
the clutch, you will get no sound from throwout or idler
bearing with the clutch engaged. (there is no relative
motion, so they aren't working.) As soon as you step on
the clutch, though, the fork pushes the throwout against
the pressure plate arms or fingers (depending on what kind
of clutch you have) and then the bearing turns and can make
noise, even if you haven't pushed hard enough to disengage
the clutch. Once the clutch is disengaged, so the tranny
shaft is not turning the same speed as the flywheel,
THEN your idler bearing starts to work and can make noise.
But if your throwout is noisy you probably won't hear the idler
bearing unless it is really bad.
Sometimes on a downshift, especially a hard downshift, you will
hear the gears speed up in the tranny. Depends on what kind of
oil, whether or not your synchronizer is working, and how thick
your floor mats are, same as with tranny in neutral with clutch
engaged. I sometimes notice it in the 122 and really noticed it
in the 544.
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