The same thing happened to my 2000 Amana. It was one of the first Amanas produced after Raytheon sold Amana to Goodman. After only two years, loud roar in the spin cycle and to boot three different reparimen couldn't diagnose the problem. Ultimately Repairclinic.com helped me diagnose the root cause. Bad main tub seal - what a surprise. When I finally got a repairman who could fix it, he refused since he said it would take more time than the machine was worth. Becuase I had a 5 year service contract, the retailer decided it was cheaper to replace the machine. And yes, it had the dreaded plastic outer tub.
Appears that any Amanas produced after Raytheon sold them were doomed. Still have the matching Amana dryer. It is going on 6 years old. Have to say that although Amana dryers since 2000 have had the worst repair record (per Consumer reports, mine has been fairly OK so far - just a squeaky idler pulley or something like that. Of course my washers get a much heavier workout than the dryer ever could........