Ok the problem here is going to be either the bearing has gone bad at the rear of the tub or the spider arm on the rear of the basket has broken.
You would need to take the top and rear panel off the machine, disconnect everything from the tub (shocks, door gasket, springs, detergent dispenser, pressure switch, pump).
Next pull the entire drum out through the rear, Remove the clips holding the two half's of the tub together. Pull the tub apart then examine the basket, if the spider arm at the rear is broken then the basket will need to be replaced.
If The basket is good then the bearing is bad, this is built into the rear half of the tub meaning the rear half will need to be replaced.
Below is a link where you can order the part, I recommend you order the part here since they offer a 365 day money back guarantee even after the part has been installed. Most other appliance parts suppliers offer a zero returns policy or 90 day.Click here to order the part
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