Just did one the other day on a Durango..same setup
Part on the window regulator broke.You should find a plastic piece or 2 in the bottom of the door.
Window regulator has to be replaced.
Comes as one complete unit including motor.
Not to hard to replace
Follow instructions on link below...'Cept you dont need to remove the glass from the door.You can unbolt it from the regulator and then raise it up fully and support it with a block of wood while you remove and install regulator
Remember ,when you remove the door trim panel ,take out all the screws and then lift up and out on the panel.It has plastic hooks that will break off if you pull directly out on it.
and make sure to disconnect the inside handle rod from the handle.You'll see it when you get there.
Hope this helps