1999 Dodge Caravan Loud Noise at Speed

Hello

Our Grand Caravan makes a lot of noise once you get past about 10 MPH. I thought the rear tires might be bad and just replaced them, did not do any good. My son believes the noise is coming from the front end.

The noise does sound like low pitched whirring, something that would come from rotating machinery, and it changes pitch and volume with speed changes.

Thanks

CWJ