Update: After replacing the TV Boost valve, and removing the TCC solenoid (I'll replace that later), I now have a transmission that behaves itself for the most part. My only remaining complaint with it is no first gear takeoff. It wants to start in 2nd. The first time you pull it down from park into OD, it will start in 1st. After that, it always starts in 2nd unless I pull it down into manual 1. The shifts are crisp, on time and just what I'd expect from a GN. Interestingly the pressures aren't the same anymore in manual 1 and 2. They're not much more than 100 all the time. In fact, the whole trans stays between about 70 and 110, the entire time. Is that normal? I can't complain about the quality of the shifts at this point. It shifts great! Just no start in 1st. Any ideas?