OK, finally went through the whole thread (with a sidetracked scan of the SuperBurb thread). So you're using the shrifter with a 6L80 eh? How are you liking the trans? I looked into that for my project but it just wasn't gonna really work out with what I was planning so mine is going to be used with a 4L80 with a 6 speed valve body instead. Does the 6L80 engine brake on down shifts with your setup? I'm sure it's in here somewhere but are you using an OEM PCM or something aftermarket?
Oh BTW, my shrifter is the anodized one, and my 4L80 has the bell cut off to mount a 4L60 bell with a machined adapter plate, here's pics:
