From everything that I've read, you want it to equal zero under full load, when the pinion comes up a few degrees. So the initial "resting angle" should be down 2-3 degrees so that it ends up near zero under full acceleration. That's what I'm shooting for by adding the pinion angle shims. And you have my numbers backwards. it's actually 3 down on the trans and 3.5 up on the pinion right now.