Help

I did new front brakes and wheel bearings on my XD yesterday, somehow the passenger side half axle popped out and all this fluid drained out (was brown like motor oil). What type of fluid was it, transmission fluid or gear oil (or are they the same). Where do I fill this fluid at? I couldn't locate the dang transmission fluid dip stick anywhere to check. Lastly, I need to take my car to the alignment shop this morning, can it be driven with that much fluid loss? Thanks.