Update:
Drove the SVX first time after the q-panel and tranny cooler cooler work....
The distance required for the TCC to lock is now half of what is used to be.... 9 km instead of 17-18km, so the original cooling setup was too much under these conditions anyway.
I monitored the fluid temp with a lap top. The Marshall temp gauge is still being shipped from California... The temp never got above 171F in the pan. The conditions were the easiest possible, though. Mostly just cruising and 32F ambient. The car was garaged at room temp (as always), so I did not start at freezing point
.
The opening temp for the bypass is 180F so I guess the flow never reached the cooler this morning.
/T