If I'm envisioning your description correctly, it sounds like your freeze plugs at the rear of the engine block are leaking. They are impossible to get to without pulling the engine or the tranny. If it's leaking as quickly as you say it is, you need to take care of it ASAP if you plan on continuing to drive it.
1992 Ford Bronco
E4OD- B&M Stage 2 shift kit
Full 3" stainless Bassani Exhaust
32" BFG's/stock suspension
"No replacement for displacement."
"Our lugnuts require more torque than most Honda's produce!"