The transmission is supposed to be filled for life. Change the dust filter whenever you feel like doing so, or clean it once in awhile. I think the non-static type is washable. Timing belt, just check it for wear, although I would change it at 70k even if there weren't any visible signs of aging. I don't remember the transfer case and differential... maybe it's like the transmission.

Oh, nice to see you have two American cars in your stable

Kuan