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revhead90 posted a topic in Nissan Silvia (nissansilvia.com)I have noticed that when changing gears (s15 6 speed spec r) from 3rd to 4th during day to day driving I sometimes get a slight crunch vibration feeling through the shifter. I took this as me messing up a shift, maybe releasing the clutch too soon or something. But as I have become more confident with the car and enjoying some hard acceleration (freeway on ramp etc..) when travelling at a decent speed and rpms up near the 6k+ range and I go to change from 3rd to 4th I get a very noticeable crunch vibration which can be quite harsh feeling through the shifter in my hand accompanied by an audible crunch noise (not as bad as a dodgy gear change, just a deep sounding crunch/vibration) Shifts perfectly 95% of the time during standard driving. Is it maybe my clutch not coping with the higher revs/speed of the engine/transmission? Syncros? Overfill gearbox maybe? (Castrol Syntrans 75w85 gl4 full synthetic fluid, filled to fill plug spillage level according to manual about 3000km ago) Any help would be great, don't want to inadvertently damage my car. Also getting a vibration in the centre of the dash at high driving rpms. Probably unrelated and due to poor fitting of aftermarket stereo by previous owner but though I would mention. thanks.