High frequency metalic parts rotation noise when accelerate

[zwddl]

My 2004 Caravan, during the speed going up from 35km/h to 60km/h(22m/h to 38m/h),a kind of metalic parts rotation noise can be heard(a little bit whistling like)when accelerating.The faster the speed the higher the frequency of the noise andafter the speed above 60km/h it disappeared.It is not EGR valve because I'v just changed it and the noise is still there;it's not the alternator, Ireplaced it too.A service advisor guess it's due to wheel bearing,but the mechanicwho checked my van actually said he could not hear any noise.Oh my god,My wife my friend and I can hear it clearly there annoying me everyday.any one has any idea about this please?

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[kurtdaniel]

it could be an exhuast leak. My car does the same thing, thats why i have to check all my dodge wm300 power wagon part specially the exhaust system, because its just so irritating that you can always hear a knife sharpening sound inside your car.