driving home from a car show today ran into some probs. rear end started howling bad. pull over i am empty of rear end fluid. i fill it up and the seal where (dont know exact terms) pinion mount is leaking bad. where the drive shaft bolts on. like right behind that towards the back. am i screwed and need to get a new rear end or if i fix this leak am i fine? its bagged but i have no stress on the pinion angle... its a 91 reg cab short bed. thanks.