at half to 3/4 throttle it shifts fine but under full throttle if slips, defuels, or something weird. level 4 I drive truck half of the time and my wife drives the rest of the time. :help2: does anyone have a cure for this? 2004.5 LLY 2500 4x4.

Is the Ally stock?

Yes, no mods

It might have something to do with the outside air temp, depending on where you are located. Mine did that and Edge is supposedly working on a fix because the unit in general does not work when it's cold out (see other related threads). I read on another thread that Edge says to tie the box to the upper radiator hose to keep it warm. It seems to work as I am in MN running without my front cover now and it's fully functional. Haven't experienced what you describe since I tied it to the hose. I really thought as you do, that my tranny or something was slipping. Call Edge and get on the list to get your unit updated when the fix is available.