97 powerstroke w/e4od.

Looking for some basic info on the banks trans command. My truck has one installed (by previous owner) and I really don't know what it does. What brings me to ask this though is my trans acts up sometimes nothing major but it just shifts hard sometimes and I'm wondering what the trans command might have to do with that. Can someone give me some info on them what they do and pros and cons of any? Thanks in advance for the help

 

Exactly what it does is firms up the shifts depends on load and throttle position iirc