My GE washer just did the same thing yesterday. I pulled it apart and it appears that they came out of something connected to the bottom of the transmission. I looked around to see if I could just replace the part where the bearings came out of (the brake Assembly?) and it appears that I have to replace the whole transmission.
Here is a link to the part I think you need.
http://www.appliancepartsworldwide.com/Store_Part.aspx?Id=119126
Eddie
December 2008