This is a query similar to asked question dated 2/22/06 by applguy and jcabouch, I have a kenmore stacking washer/dryer unit model 91081 where it began to leak water and now makes this rasping/grinding noise during agitation cycle. During the initial fill cycle It began to leak water, so I poppped-off the front panel and observed while in action. The hoses appear intacted not wet and squeezable, Drive belt is in good shape, I observe belt spinning quite fast compared to agitator, bad sound can not pin point. Water is dripping from small plastic drain outlet right above the motor/water pump. after drain water from tub, removed softener tray, removed rotated cap that softener tray sits on to reveal bolt of agitator, which I can not get off since bolt is really embedded into top of agitiator, is a special tool required or referring to old question you mention total replacement of asgitator if embedded or transmission change.. Please advice??

I have a new problem with my machine, that's why I'm on this site. Here's what fixed my problem that was the same as yours. I hope it helps. Worker for me:
sounds as if you have a bad motor coupling, you can search you tube for keywords, whirlpool motor coupling, far easier to watch someone perform the repain that try to explain it, easy to do!!! part number 285753. sears parts.