So I recently had my tranny upgraded to a suncoast level 4. Mike L worked his magic and I was happy. When I got home 800 miles later, I started really playing and noticed my torque converter would not stay locked above 80mph. I can duplicate this situation at will in any power level from completely stock to ppe hot. This is how it goes. The 1-2 shift is great. The 2-3 shift is great. Once in third gear, the torque converter goes crazy. It locks and unlocks repeatedly. Then it shifts into fourth and it is a repeat of third. Once in fifth it will stay locked until about 80 mph. Once above 80, it jumps back and forth between locked and unlocked. It seems to be more rpm related than speed related. Pretty much anything above 2400 rpm's. A tech 2 can command it locked and it will stay locked. Mike suggested the input speed sensor. The tech 2 did not really see anything out of wack. I ordered a new input speed sensor, and the dealer ordered the wrong one. I am just frustated as I finally have a built tranny but still cannot play. Any suggestion on how to tackle this problem would be appreciated. Now, just so nobody gets the wrong idea, Mike L has been great in helping me with this. I do not believe this problem was caused by any work done at his shop. So lets be civil.