Company truck just had the transfer case replaced (not impressed by my parts changers- requested a bench rebuild). 170k km they have seen them replaced at 50k km. I treat the truck as my own- wondering what the story is on these, this one has clutches and the auto function which I do not use although I do use 4x4 alot in the winter and on gravel roads. Do not know the case model- I understand there were three different models, my old NP241 got a chain and bearings thrown at it due to the 700r being out for a rebuild on my personal truck.