I put my 87 Bronco ,aod ,manual transfer case, manual hubs in the mud yesterday and it pulled out of a few holes fine in 4wd. I then turned around and went back through the same holes and when I put it it 4wd it acted like it was slipping. It would pull, rev, pull, rev. I made it out and decided to call it a day. When I got home I thought to check the fluid in the transfer case and when I opened the fill plug Fluid shot out of the hole. Is this normal? I was under the impression that it was like the rear and supposed to be filled to the hole. After searching I think the shift forks could be the problem. Could anyone give me a little insight as to what could be going on or suggest what to check?