OK guys I give up. My Allison is smarter than me. My torque converter has only twice gone into lockup all winter even when the trans temp is at operating temp. (150deg) and Duramax running (190deg). The only time lock up has come on is when the outside temp has been unusually high-65deg or better. What controls this thing going into lock-up trans operating temp or outside temp? Or is there just something wrong with the trans? The difference in RPM's at 65 is 2200 with no lock up and 1900 with lock up-pretty substantial.
Any feedback would be appreciated before I've got to make a trip to the stealer, Ooops, I mean dealer.