i know you say you think it is your torque converter but maybe its not.... I know your truck is not that old but maybe consider looking at your universal joints on your drive sharft. my 99 was doing the same thing i would hear a clicking noise when i drove it. my uncle which is a mechanic said maybe its the TC. but when i lifted my truck on our hoist i found that the universal joints were shot. just maybe check that out.

 

See the previous post, it was my flexplate.