I was changeing the gear oil in the front diff and frnt wheels. After draining both, found the fill plug for the axle/diff but where the fill plug is supposed to be for the frnt hub assy, it is not drilled and no plug is there. I've looked through the manual to be sure what I'm looking for. It is not there. How are you supposed to get the gear oil back into the houseing??? Is there possibly a bolt that holds the tie rod or upper balljoint that is drilled all the way thru the houseing to the oil area???