easy to check
Take the TCC out of the transmission. Next get a 12v battery that goes in a flashlight(square one) two wires one pos the other neg. Connect the neg to the battery and blow in the TCC while tapping the other wire to the pos on the battery. If the TCC is working it should stop you...
I build transmissions on the side and have several 2004r to build. I can not tell which one came out of a GN or Chevy SS. I know the governor is different How to tell the difference. Size of the weights?