How do I know if the torque converter is out on my 2001 olsmobile Aurora

What is your question?

Was driving on the highway all of a sudden the rpms jumped up really high and the car wouldn't go over 40mph then wouldn't drive at all a few days later I went to drive it only a few feet and it went it to drive just fine...but didn't drive it more then a few feet tho. When it initially happened heard a grinding noise but only for a few seconds. When I started it back up a few days later it didn't make that noise