Ok, so after spending way to much time on cumminsforum, I noticed for the 47/48 RE there is a box you can buy, it increases the line pressure in the trans to help hold everything better and reduce chance of slipping at low throttle.

I got a 44 RE, and while not yet slipping, I would like to stop it from happening ever, preventative maintenance, so, do I need a aftermarket valve body and shift kit? Where is one of the controllers for the 44re, Im sure those with the 42 RE, and 46 RE would appreciate having this too.