If the PCM and harness was originally running a 60E/65E, then it will run with the existing arrangement. If you step up to the 4L80E, then a small adapter harness and a reprogram of the PCM/TCM will be needed. Now if the truck you got the harness out of was originally for an 80E, then a short adapter harness would be needed to plug into the 60E/65E and the PCM/TCM would need programming to run the 60E/65E. At least you wouldn't have to obtain another PCM/TCM for either trans you decide to run. GM LS series PCMs are pretty flexible from a hardware standpoint.
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"I came into this world kicking, screaming,and covered in someone else's blood, I have no problem leaving the same way!"
ÔÇ£If you carry a gun, people will call you paranoid. ThatÔÇÖs ridiculous. If I have a gun, what in the hell do I have to be paranoid about?ÔÇØ -Clint Smith, Thunder Ranch.
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