Do you have a sun roof. if so ck and make sure the drain tubes are not clogged up allowing water to back up and overflow the drip pan. The drain tubes are usually located at the four corners of the pan and exit down in the door jambs. Im not sure about these trucks of exact location. You can probabley do a search on here or google to find exact location. If clogged u can usually clear them by using LITE air pressure to blow back up the drain tube to clear them out. And make sure your pan is cleaned of any dirt, leaves etc.. Hope you find soon before it starts stinking up you trk.

 

I am not sure how much it applies to the TB, but I have had this happen with previous cars when the a/c condenser drain tube was blocked.

 

Condensor drain tube or your heater core is out if it smells like radiator fluid inside.