ORIGINAL: 95_302_StangMan

Hey. My car is makeing a loud low howling noise. It sounds like its coming from the back end. I think it might be my rear differential. I think its that because when I bought the car last May and while driving it home the tire blew out. So we put on the spare donut tire and drove 200 miles home. My dad was driving and he was going around 70 for a while. It did not make this noise after and it did not seem to make it until a couple mounths ago. It just seems to keep getting louder and louder. There is no vibration and it is speed not rpm or gear related. I have checked the transmission fluid the rear end fluid and the the u joint all seem to be in good condition. There seems to be very little play with the driveshaft. I jacked up the rear end and the wheels do not whiggle. When I drive it while on the jacks it makes no sound(went up to 40mph). There was plenty fluid in the rear end, and it seemed that the transmision had more than enough. It is not the tires because while driving on snow and ice or gravel the sound does not change. Please let me know what you think the problem could be. My dad says we should "wait until whatever it is breaks then we will know what is wrong." But I dont think that is the best idea, also it is super annoying and I can hardley hear my radio. I have described it as best as possible. Thanks