Ok, so the tub banging when it spins is a different issue from the water draining issue, you have two issues that need to be repaired,
1. That unit does not have a pump trap filter so what happens is trash and debris etc get into the pump impeller over time and essentially messes up the impeller until finally the pump will not drain properly as it is doing now. replace the pump and the washer will drain correctly.
2. Make sure the washer is level and that the loads are balanced in the tub, if you still have issues with the tub banging then you will need to replace the suspension rods on the machine.
Washer Suspension Rod Kit
Part #: W10110314 - click here
Washer Drain Pump Assembly
Part #: W10276397
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