I have a 2000 GT convertible 5 spd. I have had the car since November. Ever since i bought i have had rear end noise, sounds like a hum/howl. I already had the differential rebuilt and had 3:73 gears installed, that helped the noise but it is still there just not as loud. The auto shop that did the differential told me that the remaining noise is because the rear passenger axle shaft was pitted, so i had them change that out. But i still have the same noise, now they are saying that they noticed that the other shaft is also pitted. But i don't think that a pitted axle shaft would cause this noise, due to the fact that it didn't get any better when i changed the passenger side shaft. Any help would be really appreciated.