Only thing you should ever mess with in the shift times tables are the mutli's, other then that, leave the base shift times alone. Was told by a GM ecu programmer that the most common misconception that people have about shift times is that it makes their car shift faster, when in fact the clunk that you feel from lowering that table is merely a shift "error" and a reduction in line pressure. Those shift times are merely set the limit to how long it should take for the transmission to shift before going into shift error, if you reduce those times to an un-achievable value you will error all the time. My shift time tables are totally stock and my average shift times with the transgo shift kit are .1-.2, no more no less, rest of the adjustments I have made were merely dialing in the firmness of shift pressures and TCC duty cycles. Now it shifts fast and smooth as butter, without that harsh neck snapping feel.
