You sir know your Chevy trucks lol. you are correct my truck is a 1997 but when I did my swap 2 years ago the doner truck was a 1998 k3500 GMC and there was A LOT of difference between the models... None of the firewall plugs wer the same so had to change basically all the wireing. Front to back. Under the hood, dash harness, steering colom, headlights, so my truck has all the 98 wiring and the 4 plug ECM as well. What a job.
Cool, thanks for the response!
I was secretly hoping that HPTuners had adopted support for the '96-'97 PCMs. I would love to buy tuning software for my '97s, but unfortunately the only real option I can find is Jet's DST (formerly TunerCAT) and it doesn't look nearly as nice as HPTuners.