This is the first part of a many part series covering what the tables actually change when tuning a 6L80 transmission. Many of the tables aren't very intuitive and the descriptions are very misleading. I'm going to run this tapped and prodded valvebody in an otherwise stock vehicle so we can actually see what is changing when we tweak the calibration. In this video, I show what I did to the valve body and proved it out on the trans dyno before installing in the vehicle.