Update
I believe I have the transmission issue resolved. I installed a rebuilt valve body and the TCC lockup issue was resolved. In addition the transmission ran much cooler after the valve body was installed. I went ahead and installed the transmission cooler as well. My transmission temperature runs about 170F going down the highway and 185F or so in stop and go traffic. This is with an ambient temperature of 93F. We had some cooler weather here this past weekend, 70F and the transmission temperature ran about 155 on the highway and 175 in stop and go traffic. The lockup works great, I set the cruise on 75mph and watched the tach, and it read 2330rpm and never drifted more than 15-20rpm even on the hills.
I just hope I have not damaged the transmission, because I am sure I have heated the transmission up to the point that it did not want to shift. Not sure if it was in limp mode, or that the heat caused something to expand to the point it would not shift. I drove the LC from the lake to home Sunday afternoon, 190 miles, it ran great and the transmission shifted prefect. I did check the mileage and it went from 15mpg to 18.5mpg. That was driving 75mph for about 165miles and the rest was in town driving.
Old valve body
Found the 1-2 shift check ball stuck in the separator plate.
New valve body..
Installing new separator plate and gaskets.
Installed the valve body, filled with fluid and drove… very happy