Looked under the truck the other day and noticed the mat under the cab has fallen and is resting on the tranny, t case, and front driveshaft. Anybody have an idea how to make it go back up and stay up? It looks like it might have been like that for awhile.

 

I believe they are hung up there with those push locks I would guess that your push locks came out, broke off or the matt tore around them. if it is one of the first two just get a hand full of new push locks and re-install. if it tore around them than remove them with pliers and get ones with a bigger head or use washers.

 

I looked under my truck yesterday and the fastners are actually a plastic nut that push on to a threaded stud welded to the floor of the truck