There's a 94 V6 4runner that I yanked some parts off up here in NW Montana. 240K miles. Still has the trans and T-Case. I don't know if that's too far for you.
I feel like dual cases are just a "cool" thing to do for these rigs and ill be willing to bet that more than 75% of the rigs that have them either don't use them or don't need them... happy hunting!