In my 98GT i have this 'wooshing' noise coming from my rear end. The faster i go the faster IT goes, and the slower...the same. I brought it to one of my ford mechanics (whos a friend of mine who does all my rear end work) and he told me the rear axel bearings went bad. So i asked him how this happend, and he told me that it just happens sometimes. Well the car is almost like 6 years old so i guess it happens... So my other mechanic and i take apart the rear and replace the axel bearings, which were rusted and broke as we took them out. So...good thing we replaced them. $150 all said and done..but the noise was gone! ...And then late in the evening the next day, the noise came back I haven't brought the car back to my mechanic yet. But im asking you guys: "WHAT THE HELL IS THIS NOISE?! AND WHERE IS IT COMING FROM?!" NOTE: I never had this noise before i did my 4.10 rear swap a few months ago. BUT this noise came only after about 3 months of having the gears in. And my mechanic shimmed the gears perfectly so i DONT think this noise has anything to do witht he 4.10 gears themselves...but guys, please let me know. Its f@!%ing annoying!