Product review (5 stars): First part to look at for fixing shaking washer
Fixed my washer from shaking across the floor.  I suspected the springs were wore out, so I changed them first.  That helped but didn't completely fix the problem.  Do yourself a favor and replace the springs and pads at the same time, or at least start with the pads.  It's a little hard to tell how wore your old pads are until you take them off.