How come my washer knocks during the spin cycle?

I have a 2003 whirlpool top load washer that was balanced when we purchased it in 2003 but it now knocks when it is in the spin cycle. It nearly walks out of my wash room. My load is evenly dispersed and I have checked the level again. It seems to be fine. It does seems to be getting worse. What is wrong.
Jean Smith, May 2005


done
is it emptying the water out fast enough? or the suspention may want looking at and also have you checked the drum bearings

aa, May 2005
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