GE Hydrowave washer agitates unevenly and roughly.
I just replaced the fuse kit on my GE Hydrowave washer. When I tested it, it now spins smoothly but when it agitates it is rough and sounds like the tub is going to bounce off its mountings.
Two things that will typically cause this: one is the sifter coil and the other is that the apron is sagging.
If the sifter coil is bad the entire tub will rotate during the wash cycle. Remove the front of the washer to watch it during wash and if the tub turns back and forth the sifter coil (mode sifter) is bad. To confirm locate the wires that go from the motor to the center sifter coil (in the center of the washer) then test for continuity between the two wires with the plug disconnected. If it is open you know for sure the coil is bad. The part number for the mode sifter coil is WH38X10017 Order Here.
If the apron is sagging the bottom of the motor will hit the bottom of the washer on a large load. Another indication that the apron may be sagging is the front will not stay on.
All of this and more on this page
GE HydroWave Noisy Washer Repair Guide
This page will help in replacing the sifter coil GE Washer Disassembly The pictures on this page are not of a HydroWave but disassembly is almost identical.