I don't see it in the owners manual, did I miss it somewhere? I see the gear oil check/replace intervals.

 

68,000 miles or 48 months if in Severe driving conditions, Fleet, Police, Taxi, Frequent towing. Page 536

Not required until 120,000 miles or 90 months under normal driving conditions Page 541

 

yup ATF+4 holds up VERY well over time

 

Oh my, I was probably looking at the 36k or 60k...that is awesome...how about the differentials. If I recall, those are pretty high milage as well, makes me feel like the truck is a much better buy than what I thought.