Out of curosity, do you live where it snows? I have rubbing sounds coming from my front end in my 01 Impala - it’s simply the tires rubbing at times against the snow and crap packed into the wheel well. However, I’m going to assume the sound occurs regardless of whether there’s snow in the wheel wells or not. Have you checked the tires? A bald or worn spot on one section of a tire can cause weird noises under certain conditions.