Ruaustinized

I have a 95 Toyota Tacoma, I was at a mud hole with a bunch of friends and bogged the truck a little. On the way home I stopped at a stop sign and noticed smoke in front of the headlights I pulled over and it was boiling hot (temp gauge was broke) I had been driving it for a while before I realized it. now the truck still runs like a top but it is pressurizing the coolant? It doesn't have milky oil or water leaking from exhaust just pressurized coolant? Also there is transmission fluid in the water? Upon inspecting the truck yesterday I found that the fan clutch was bad, I did replace it. Anybody know what it could be? I need to get it running before I go back to school.