Ok, got an issue, hope you guys can diagnose it across the net. My truck's th350c took a dump on me and so I had a shop rebuild a 700r4 and put it in. They used the brake switch I had for the th350c for the 700r4 lockup. Anyway, when I start with the engine cold, the transmission won't shift from 1st to 2nd with light throttle below like 22-25 mph. I could hold it at 20 and hear the engine get loud before it shifts. If I get it hot, then turn it off and then turn it back on, it shifts at around 10-15 mph. Purty sweet. The shop took the valve out, found nothing wrong with it but replaced it with another one but it's still doing it. Anybody got any ideas on the problem?