A/c dropping in front floor,not draing outside under car!

Go under the truck on the passenger side, near the bottom of the engine firewall you will find the AC condensation drain pipe, it will be most likely plugged, clear it.

Your drain tube is stopped up. It is located under the firw wall on the pass side. Sticks out about 1 - 1 1/2 inch could be dirt, mud, tar. Take compressed air can like for blowing off a computer keyboard and try to blow it out. Or try poke a chop stick up in it to clear out any debris. Be carefull under there.