Thank you for your question and for letting me assist you with your repair.
The direct drive washer that is knocking should be tipped forward off the rear legs and sit back on the floor. This is a self-leveling process that may solve the knocking problem. The whirring sound could be something caught in the mouth of the pump.
First check it the basket is loose in the tub. It should not wiggle or move up or down. If it does, pull the complete agitator off. Use a ratchet and a 6 inch extension with a socket to remove the complete from the bottom up
Do not separate the agitator
After the agitator is removed check the spanner and see if it is tight or the block drive the spanner is threaded on is loose.
I hope this is helpful. If I may be of further assistance please include more details in a reply to this entry below.
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