My washer rumbles and growls whenever it is agitating and in spin cycle it squeaks and groins. It will not complete a spin cycle to ring out the cloths and will always give an unbalance load fault even if basket is completely empty.
This is a frequent complaint with this model and about the only thing you can do is open it up and check out a problem in the tub support area.
Here is a link to a service manual for the Whirlpool version of your model.
http://appliancejunk.com/forums/index.php?action=downloads;sa=view;down=99