We looked online at AppliancePartsPros.com under the symptoms and found it was most likely caused by the shocks. Of course there was a repair video showing how to replace all four shocks step by step, and there was a link for purchasing the four shocks at the bottom of the video. Our repair didn't go quite as quickly as on the video because we are novices, but we were able to do the repair ourselves and, once again, saved ourselves a ton of money! Now we have a very quiet washer and dryer again (Look for our post on repairing our Whirlpool Duet dryer.) Thanks again AppliancePartsPros.com, you are awesome!!