2 years later and I'm replying.
Was the Differential (parrently something in there was bad (IE, Shredded).
Replaced it.. Ran fine..
now a Different Noise :-)
Something like a Clanging when I start to move forward or backwards. It only sounds when the car is either slightly accellerating, or moving backwards slowely (like something is unlocking and locking again). This is a very loud noise and I can feel a slight vibration from it.
This is also located somewhere in the rear. I'm starting to believe it might be in the wheel well or something near it.
oh and the Differential is acting up again. I think I may attempt to just replace it myself.
EDIT by blindxeyed: Old thread can be found
here