Thanks we are about to get an 08 king ranch f350 and were not sure if its a factory thing or a dealership thing. Good engines though the 6.4s? We want something much newer then the 7.3s and better reliability then a 6.0 but no matter what mods are needed but the truck only has 25,000k and i think the warranty's up to 100,000k. Hate to break something and not have it covered.