The problem with bricked LT1 pcms is that it's cheaper to get another one out of a junkyard than it is to try to fix it. You've gotta unsolder a tiny chip, flash it with a chip flasher ($100 or so),...

I can lend a bit of advice on transmission tuning as I have had LT1/4L60Es for a long time.

1. The 4L60E has no built-in pressure sensor to provide feedback to the PCM, so all it can do is gauge...