The BCMs are program once only. The VIN in the BCM and the PCM need to match and since you can't reprogram the BCM, it's far easier to use a tuner to program the VIN from the car (and thus, the BCM) into the PCM that comes with the 'new' motor.
When you have the VIN programmed into the PCM, make sure all the letters are in UPPER CASE. If not, the VINs will not match and you won't be able to start the car. You will also need to do the 30 minute security relearn procedure, but after you complete that the car should start and run.
_________________ 2001 Galaxy Silver 9C1 w/ L67 and 4T65E-HD...and a few other mods.
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