If you'd read the thread below entitled gearbox oil then you'd know that it's 75w-85 that's recommended - API GL4 - although 75w90 or API GL5 are OK too. Preferably use a fully synthetic gearbox oil for the transfer case (this is not the centre diff - that's in the gearbox) - all the drag racers driving Mitsubishi Eclipses/GVR4's seem to prefer Redline oils for all the driveline.
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