Diagnosis
That's a worn-out or failed drive shaft coupling or spider arm. The WTW8127LC uses a direct-drive motor, and the metal components connecting the motor to the wash basket can corrode and break, causing severe vibration.
How to Fix It
You need to inspect and likely replace the drive system components. This is a major repair.
1. Unplug the washer and remove the cabinet (the outer shell). This involves removing the top panel and a few screws around the back and sides.
2. Once open, look at the large wash tub. At the rear, you'll see a large three-pronged spider arm connecting it to the drive shaft.
3. Check this spider arm for cracks or severe corrosion. If it's crumbling, that's your noise source.
4. The repair kit (often part #W11035622) includes the spider arm, seal, and bearing. Replacing it requires removing the entire inner wash basket—a big job that often justifies a service call.
If That Didn't Work
If the spider arm looks fine, the noise could be from worn tub bearings. A telltale sign is leaking water from the center of the rear tub. Bearing replacement is an even more involved repair.
Heads Up
Running it with a broken spider arm will cause catastrophic failure. The tub can become unbalanced and tear apart the suspension. Stop using it until repaired.