You guys sparked my curiosity so I checked my new Ford Manual. It says change the tranny fluid and filter at 60K for a 5 speed and 150K for a 6 speed. Wow! That's insane. I guess I need to talk to my service advisor. I don't think 30K is an unreasonable increment, maybe less if he truck gets a lot of rigorous towing, which mine doesn't. Maybe that's the recommendation for a grocery getter.
My manual also says 7500 for oil and filter and even with light towing, that's to much in my opinion, even for a gasser. Mine gets done at 5k on everything I own. Personally, I don't think it matters if you use synthetic oil, it still needs to be changed.