Rear diff iro 1.75L SS75W/90 or EP80W/90
Front diff 1.3L SS75W/90 or EP80W/90
Gearbox 2.4L MT75 fluid
Transfer 0.5L Dexron 2

There are no drain plugs on the diffs, so you would need to remove the covers on each. Probably least in need of oil change.
Gearbox is a real good idea to change the oil on, as the MT75 fluid gets very dirty (probably high detergent level).
Not a bad idea to change the transfer oil. Drain this into a clean container. If there is any evidence of a grey sludge then your VC is losing fluid.