The dealer will reprogram your puter with a generic file that comes with the kit. What you need to do is have someone monitor the air fuel ratio, timing and a host of other things to truly fine tune it to your vehicle. IF your dealer does this then you're very lucky.
As far as torque converters go, it is really an art. When you add a converter alone the shift points are actually softer which is why you need to add a shift kit. Also a shift kit will allow much less slipping between gear changes. This in turn lowers heat which is good for reliability. There is a balance though. I don't want to have to wear a neck collar when i drive
THe explanation of what a converter does is accuarte but simplified. The reason it adds more stress on the driveline is because it lays down huge power from a stop. WHen your trucj weighs 7000lbs and is 4 wheel drive you can start to see where really aggressive starts can cause problems. Now if you have the power Ken has who cares because you simply ignite the tires from a stop. That is about as cool as it gets.
Joe