So doing an oil change this morning on my '91 ln106 2.8 Surf before having coffee, bit bleary eyed and took the drain plug out of the transfer case instead of the sump. Realised what I'd done and shoved it back in quick smart but some oil did drain out. Pushed for time as we're heading off on a trip tomorrow so I my question is, on the push button 4wd setup is the transfer case actually driven in any way if the vehicle is in 2wd? i.e. can I get away with not topping up the oil until we get back? We'll have no need for 4wd while we're away so that's not an issue.

Cheers in advance for the advice.