PCM Swap Question

[Chevy366]

People flash different OSs on PCMs all the time , the 03 may be 512 and the 05 is 1mg of space why you can't do it , or HPTuners just can't .
Some may have small differences that may effect the way the engine will run and you have to do a segment swap .
The connections are the same .

[HotRodV6]

People flash different OSs on PCMs all the time , the 03 may be 512 and the 05 is 1mg of space why you can't do it , or HPTuners just can't .
Some may have small differences that may effect the way the engine will run and you have to do a segment swap .
The connections are the same .

well im using Tunercat OBD2 tuner and winflash to flash the PCM, im sure the 05 program was to big for the 03 PCM, like you said. But as long as the connections are the same, im good.

Thanks for the info.