With your 700R4, has it been rebuilt? What mileage is on it? What did it come out of? I had a 700R4 in my C10 for about 6 months and I had adjusted the TV cable as best I knew and the trans smoked very quickly- but mine had 130K on it, and it was not treated well by the previous owner. Mine always shifted fine though- I wonder if you have another issue with the trans. Can you manually shift it? How does it feel when manually shifting?