Oil question

Have a ride planned in the morning.a few day ago made trip to my local dealer and purchased everything (i thought) needed to service my rzr.

I drained all the fluids tonite and just realized I did get any fluid for the front diff.
Is there anything I can use from auto parts .A friend with a rzr said he uses fully sythetic atf,,I dont want to mess anything up but would really like ride in tomorrow.