Probably shouldn't be starting multiple threads about the same problem, just sayin...
Other thread said it started at around 30mph, and continued to get higher...
also a 2004 GT, btw..
Does the whining stop when you lightly press the brakes?? I had a caliper that wanted to randomly stick, and thats what was causing it..
PS pump will groan, not really whine.
Could possibly be a stretched belt rubbing, or any number of other things.
Does the whining increase steadily with the speed of the car??
Try to determine if its comming from the Driver/passenger side, then try to tell if it's comming from the engine bay, or the wheel wells.