[soutthpaw]

Interesting, I was just reading a tech article about TC hard lockup issues and they pointed out that its not always TC/ trans issue
"A simple random misfire
could prevent the PCM from engaging
the converter clutch, and there need not
be a DTC set for this to occur. Yet openloop
scenarios, faulty ECT sensors and
VSS problems are still the familiar reasons
for a loss of TCC. A more sophisticated
TCC apply strategy provides additional
possible causes for its malfunction"

Probably not you case but you may want to PM Cody and see if he has any ideas...