2000 Maxima makes a whirring sound eminatind from the rear speed makes the sound higher in pitch and frequency it sounds like I have snow tires on it starts at 25mph to be noticeable?

I have a 2001 Maxima and it did the same thing, I had to have the rear struts and new strut mounts put on. The struts are what keeps the rear aligned. When you go to have your Maxima aligned, the diagnostics shows there is no adjustments for the rear. The dealership will tell you that the struts and strut mounts will need to be replaced. The longer you wait, the more damage you do to the rear tires. I replaces the tires at the same time, total cost was $1200. ==Additional Answer== I have a 2000 Maxima SE that was doing the same thing that you are talking about and it turned out to be the rear wheel bearing. You might check that out. AutoZone has the wheel bearing for $215, which seems high. You might could get it cheaper from somewhere else. Hope that helps.