I have a noise that sounds like its in the rear end. I thought it was the u-joints because is a vibration sound only when I'm driving. It sounds worse when I'm going faster. I just replaced my u-joints andI am still having the same problems. I have also put oil in the rear end...

Does anyone have some ideas?

 

Bad wheel bearing possibly.

 

How many miles is on this truck? Does the noise go away at any speeds like loud untill 70mph than goes away? Does the noise only happen when you drive between certian speeds like 30-40mph and then go away... Did you just add fluid to the rear diff or did you drain and fill the diff? Did the noise happen before or after you changed the fluid?....... It is possible the rear diff is a problem as well as the axel bearings.