My truck had been shifting fine, then I installed 4.56 gears last week. It seemed to be locking up real hard, then had almost a chatter to it when it was locked up. Well yesterday it seems to have stopped locking up all together. I logged a run (I can post it if it will help), and it shows that it is locking up, but it does not feel like it, and the RPM's are not dropping when it is showing locked. I assumed it was calculated by the input and output shaft.