Op your truck is super nice! I noticed it looks like in your pics you still have the non elc coolant in it. I have an 03 7.3 liter truck and I finally got around (last night actually) to swapping the coolant out to extended life coolant, and would suggest you look into doing the same. Flush the old stuff out with distilled water and add the new stuff in (make sure its heavy duty diesel rated coolant.
I Love these trucks, so far I have just about 330,000 kms on mine, and I have only replaced the idler pulley, and have done the 50 cent mod to the engine (besides regular maintenance), they are tough trucks! My automatic tranny has had upgrades done to it and has been rock solid reliable so far as well.
My only fear is when the time comes to replace the truck, which I need to start looking at.
A guy can get a 6.0 truck pretty cheap now, been pondering one of those and doing a cummins swap myself.