What type of atf should be used in 4r100 in a 2002 crew cab 7.3 4x4 also what is a good torgue converter to use in this truck, I will mainly use it empty but will sometimes tow an enclosed car trailer putting on a lot of miles quickly over several days of steady driving. I also tend to be an aggressive driver at times, (pedal to the metal). I am also considering a chip, possibly a hypertech as someone I know has one and is getting rid of the truck so I can get it cheap. Not sure if this helps to figure out the application on the converter or not?