hi Rick, yes its an 8.1 / 4L80E that i installed, in a half ton, its awesome. i had a professional tuner set up the pcm with hp tuners so that i could run, from what i can see he mostly just removed the vats and my cash. I also bought a professionally assembled wiring harness that turned out to be missing connections which i also had to sort out bu myself. Im in the process of installing fuel pressure and air fuel ratio gauges so that i can watch what its doing. It runs hot so i want to change the fan settings for starters. I do not have the checksum plugin for that file, and i don't know how to use it yet, steep learning curve, i was hoping to make a clone of my pcm just in case i screw it up. i have a second pcm with OS 12216125 also set up to run this truck but it doesn't work properly
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