Thanks Tom. Will investigate a little further per above, but need to decide whether to replace the trans, or try replacing the converter alone.
A call to Sonnax indicated that their stator support ($75 on rockauto) needs to be fitting by taking the whole valve body/chain cover/chain apart.
Trying to find out if the turbine shaft (input shaft?) can be r&r'ed from the converter side.
If I could do both plus the converter it would seem every base has been covered.