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Sounds like the identical issue I have.. mines probably the input shaft bearing..

Mine is currently whining quite loudly in all gears and i'm getting the gearbox pulled down this tues..

If it's just a slight bearing sound - don't worry about it at the moment - when it starts whining than look at getting it replaced..

costs about $700 to replace it ($70 part.. rest labour) unless you can do it yourself.. also worth doing your clutch at the same time..

Will it cause damage if the problem isn't fixed if its a clutch throw out bearing?

No. Usually the noise gets worse with age as the bearing grease dries out and loses effectiveness. In one extreme case I saw, the bearing had seized, but the car had a LOT of k's on it and was pretty much junkyard material by that stage anyway (not a Nissan, btw).

In 99.9% of cases the clutch will need replacing before any problems will occur from a noisy thow-out bearing - apart from the noise, that is.

That said, and like every other 'I've got a funny noise' type thread ever started, each of us that has responded here has not actually heard the noise for ourselves, so to that extent we are 'guessing'. If you still have concerns you should get someone with appropriate experience to have a listen and follow their advice. Of course ours is free, theirs probably won't be.....

Edited by SteveL

If it makes the noise in neutral and gears with clutch released as you said.

It may be just the gearbox bearings in the best case scenario, or worse case it will be the hard casing worn off the input shaft and cluster gear set, causing the noise and wine.

Make sure someone that knows what they are talking looks at it, as you don't want to pay $600 odd bucks to get the bearings replaced if the hard casing is worn and its still going to make the noise after the rebuild anyway...

If you can pick up a genuine low km box from wrecker or half cut for $500, might as well just do that.

There is always confusion as to what is gearbox noise and clutch thrust bearing noise, if its the clutch thrust bearing it will only make noise when the clutched is pressed to the floor. This is when the carrier pushes the thrust bearing into the pressure plates fingers, causing the two halves of thr thrust bearing to spin and if the bearing is f**ked make noise obviously. (Only get this problem usually if the bearing wears out from the owner sitting at the lights holding the clutch in, instead of selecting neutral and releasing the clutch)

Just stating both issues as your post isn't entirely clear.

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