Repairing a noisy Whirlpool AWM 5145 1400 Spin washing machine?

I have got a problem with my washing machine when it goes into fast spin, it starts making a loud banging noise. The feet are set level, have checking in the back to see if it is catching anywhere but it isn't, the weight on top on the washer is fine and all the springs and struts all seem fine as well. The noise only starts when it is its fastest spin, it is fine at all other times.
Any advice would be much appreciated.