Bongo Fury

I am changing all the oils in diffs, T-box and autobox.
Will EP80 be OK in the diffs and T-box - I havent quite got enough EP90 to finish topping up the transfer box but have a can of EP80 left over from my landrover days.
Incidently the oil in the transfer box looks cleanish but is much thinner than the oil drained I from the diffs. ? why - any thoughts.

Actually I think Ive answered this myself. The EP80 is only GL4 not GL5. So I think its off to the shops for another can of EP90.