Last week I broke my washer (by washing a very heavy off center load), and was devastated. After a few hours reaching online I found out the problem was quite simple to fix.
There are 4 dampening straps that keep tub from moving too far. The heavy load stretched them out so far that the tub was banging the side of washer.
We opened up the washer, and took them out. Then we made our way to Sears to buy new ones for $5 each. We came home and had our washer back together in no time. He said it was easier than changing the oil in a car.