Bill,
Besides the upgrades, all the parts (thus seals) are original. All maintainance replacement thus far (besides fluids) are platinum plugs, pcv valve, cap & rotor; that's about it.
Frank.
Bill,
I've changed to Mobil1 Synthetic in the axles & transfercase & tranny since it was 39Kmiles - no leaks - no oily dust around the seals at all (now at > 63Kmiles).
Frank.