From what I’ve seen, the def gauge goes to full. Just make sure you don’t have any codes saying you need to regen so I’d do a full regen before you install tunes. Wouldn’t think grid heater would be shut off unless you take it out and do the delete, think intervals for CCV are like every 67,000miles, I’ve changed mine once, it’s no big deal but I suppose you can turn it off if requested and run your own breather.Trans tuning is offered for the 68rfe. Just not for the Aisin. If you have a G56 you get to do your own trans tune.
So does the def gauge go to full or empty? Is the grid heater killed or must that be requested? What about the CCV? I am leaving mine for now so how is that handled?