How to tell when Torque Converter going south?

[ineil]

Had my in the shop for a while to get the brakes converted to Vacuum. After I got it back, it seems strange. It feels like I am spinning the tires all the time, until it hooks up. There is a strange smell and intermitent groaning sound from what seems like the torque converter. It is also slow to go into gear. Any ideas?

 

[77 cruiser]

Check the fluid or service the trans lately?

 

[ineil]

Added about 1/2 quart trans fluid today. Trans has not been serviced lately, but has been rock solid until this issue surfaced.