eB:

Before considering replacement of the present trans, a few pressure checks are in order.
There are three pressure test ports on the right rear of the trans. A gauge (250 psi) with a hose, and appropriate thread adapters can be found at Harbor Fright.
The principal test is for the presence of working pressure. If there is no pressure, the first step is to remove the valve body, and to check it for a stuck pressure regulating valve.

In the event that the valve body is OK, trans removal will be in order. There is a chance that the aforementioned pump drive ears (lugs, tabs) on the torque convertor have been damaged.

Take it a step at a time.