My truck was heavily modified by the previous owner but unfortunately I didn't get the chance to write it all down when I bought it from him. He did do the 6.0 tranny cooler upgrade and I think he also upgraded some of the transmission internals as well. He used the truck to pull a 32ft gooseneck trailer with a drag race car in it. He liked to build cars so he ended up putting a lot of money and time into the truck as well.
My personal belief is that the 7.3s being pre-smog will end up being like the classic muscle cars up till 72. They will be highly sought after in years to come just because you can modify them without worrying about emissions. The truck isn't a daily driver, it only comes out when we are doing trips, otherwise it is stored indoors.