We did a 4l80e on a 2004 Silverado SS AWD. We have OS 12587603, after doing the 4l80 segment swap , the truck wont turn on. Just cranks one time. However I found a stock tune from a 2003 Silverado with 4l80e. Did full flash on with that tune (OS 12579405) and the truck does turn on just fine and shifts just fine. Just trying to see why it wont turn on with stock SS 12587603 os with segment swap. Tried two full reflashes and i did copy the Transmission and Diagnostics segments. Any ideas?