08 dodge don't sound right with steady driving

I can't remember what it's called it has been shifting into the thing after the last gear when barley pushing gas I had computer hooked up and done a relearn for the gears it does fine with quarter throttle or more it stops when I push gas down to get it to shift down I could be 2 or 3 and still do the same thing , i put it in tow haul runs just fine just trying to save some money just ole county boy