Very loud groan/droning sound from back end - help?

[desert_porsche]

I guess that was my bad on assuming a failing wheel bearing had to make a screaching/grinding noise!

This evening, I was trying to figure out which bearing it was. I jacked the car up and tried to see if any wheels had any play. Absolutely nothing. Every wheel was very solid on the hub (except for the fronts which have a little bit of steering play anyway). I tried rotating each wheel, and they all seemed to rotate quite freely. None of them made any notable noise except for a bit of the brake pad rubbing against the rotor. Finally after Googling around I came upon a suggestion to try holding onto the spring while rotating the tire. First three tires were perfectly smooth, could feel no vibration in the spring. Finally on the last tire, I felt vibration being transmitted into the spring while rotating that tire.

AT LAST MY LOUD GROANING PROBLEM IS SOLVED! Thanks guys

[bwdz]

There is also an easier way to determine which side the bad wheel bearing is on. Drive the car aggressive and turn right and left, it loads and unloads the tire, if turning left the noise goes away it's your left side as that tire has less load on it in a left turn.