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From your description the most likely cause of this noise is bad tub bearings. Without being able to examine your washer it is hard to tell you exactly what parts will be needed. I recommend replacing the rear tub, basket, and pulley. There may be other parts that will need to be replaced as well, but the only way to know for sure is to dismantle your washer and examine it. I am including images below that will assist you in the disassembly of your washer.
Always unplug or de-energize electrical equipment before removing covers or attempting service. Be careful and wear appropriate hand protection when working around sharp metal parts.
I highly recommend having a trained service technician evaluate this problem. You can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
Here is a link that you may use to view the parts list diagram or to purchase any parts needed;
Sears Parts Direct
I hope this is helpful. If I may be of further assistance please reply to this post.