When you get teh rear up on jack stands put it in nuetral and rotate the tires and drive shaft until you can confirm where the nosie comes from.

Brakes, half shafts (axles), diff are most likely IMO.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)