2009 AWD Torque Converter rattle?

[Gohan77]

I have posted before about a rattling noise i hear around 1500-2000 rpm while cruising and how it doesnt seem to know what gear it wants to be in around 40-50 MPH.. I took it to a shop and they were unable to pinpoint the issue but said it could be the torque converter vibrating and rattling something nearby. thoughts?