This is the first diesel I have owned as well as the first ford. I just purchased a 2006 f250 crew cab 6.0, mods include procomp lift, 37 procomp tires, edge power programmer, and lots of cosmetic upgrades. the truck has 40000 miles and from what I can tell has been really welll taken care of. What do I need to know about the truck. What problems should I look out for. I have heard a lot of good and bad. Any help would be greatly appreciated.