I am still banging my head on the wall with this combo. 2005 silvy 2wd got an LS3 out of a 10 camaro installed with a 15 pin 4L60E trans and I am trying to get this thing right. I swapped out the ecm for an 08 tahoe ecm and a T42 out of an 09 silverado as the T42 from the tahoe was damaged and I couldnt read it. I was having the speedo stuck at 158 issues until I unlocked another 08 tahoe tune from the repository and did a write entire to get the OS matched to the E38. Yesterday I took it for a drive and it would shift through all the gears about as fast as it could and wouldnt downshift until you completely stopped. I put the scanner on it and this time it shifted great and the TCC did its thing so life was good. I stopped and tried to do a launch and it did the dead pedal thing and now wont shift normal anymore. I have attached the tune and the drive I scanned when the pedal goes dead around 15:48. Any help would be greatly appreciated as I have wasted plenty of credits already on this thing and hope its a setting of some sort pissing it off.dave lewis 1st drive.hpldave lewis final 08 tahoe os.hpt