I'd first check the tub drive block.
Here's the tub drive block for this model:
Drive Block WP389140
There is a video in the tub drive block part link that shows you how to access it.
You can see the comparison here:
See the one on the left, its the old one, the one on the right is the new one. It has to have those 2 ear slots. Does yours look like the one on the left or right?
Let us know.
You will need to also order a spanner wrench to remove it if its bad:
This tool is a spanner wrench that is specifically designed for use with washing machine repairs. The spanner wrench is used to offer a good grip and exceptional mechanical advantage to apply torque when turning or preventing turning for items like nuts and bolts. This specific spanner wrench is...
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Jake