Ok first off it's an 04 Silverado 1500, I'm using EFILIVE with custom OS 2, and of course I did the 4L80e segment swap. We've done many other 4L80e swaps and never had this problem before. The only thing I did different is not wire in the front input speed sensor, but I did turn all the DTC processing enablers off for it and disabled all the slip test stuff too. Shouldn't this work? It drives around just fine at all part throttle driving and the 2>3 WOT works fine too???? Also this trans was taken from my '89 turbo LS swapped truck and worked fine in there....