So I accedently started this thread in the wrong spot the first time so let's try this again.

I heard there wasn't any real control of the 8 speed yet. So I started googling just to see if I could find when it might be available and found this post. According to Black Bear they have full control now through Efi live.

http://www.gm-trucks.com/forums/topic/175070-is-anyone-able-to-tune-the-62l8-speed/