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Is this a possibility? I have come across this topic a few times and I always thought that since the cylinder order is different (starting at the passenger side front for number 1) that it was a user...

I brought it to GM dealership.I spoke directly with tech and gave him the VIN from a 2003. We flashed it no problem. Problem solved.

Update:
Talked to gm dealer about flashing tcm with old os with VIN from older truck. Talked directly with tech. Tech had never attempted to flash older with different VIN and said he would like to...

I followed your instructions and I still get the same ERROR $0502

I have attached the ctz. file ive been trying to flash.

I have also attached the latest attachment from Rob (QUICKSTART). I...

Thank you for your help, I followed your instructions and continue to get the error $0502.

I fowarded your response to Rob and he sent me this attachment. Is this Quick start helpful?

I am trying to flash a 2003 AL5 OS into a 2004.5 AL5 TCM.

I have an autocal from ATP with all updated FIRMWARE and SOFTWARE.

I have sent a stock tune file from KILLERBEE to Rob Coddens for...

Big Thanks to killerbee!

I recently installed a built lb7 trans into LLY. Anyone know where I can find a stock 2003 allison tcm file for flashing my 2004.5 LLY TCM. Thanks in advance.