Rear-End Nosies?

Since i bought my car its been making some weired noises that come from the rear of the car. When i take a turn i hear a creaking sound coming from the rear of the car and when im driving at a steady rate i hear a whiring sound comming from the rear of the car? What can these sounds be?
 
I would get some RTV Gasket maker stuff, some gear oil, and friction modifier. Pop the rear-end cover off and take a look for anything obvious. If you don't see anything obviously wrong, it's probably a bearing.

Mine was making a whining noise most of the time, I would turn one way and it would stop, turn the other way and would get louder. Took the cover off and found a couple shims had come loose.
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