Hey I read your post on the Transmission Change on the Aurora .
I am in the middle of the same thing.
My car had a FQ2 and the junk yard sold me an FV4 along with the engine I bought.
Can you tell me the ECM is and what part number PROM you finally wound up with that fixed your problem.
I don't want to pull the motor and trans again if I can avoid it.
I am going to try and get the PROM from another Junk Yard.
The Donor car my New Motor and Trans came from already has the ECM removed.
Of course as in your case the Junkyard thinks I am high on something.
Any help you could give would save me a bunch of pain.
