1996 4x4 bump-n-clunk

when i stop or take off there is a clunking feel underneath the truck...i have never seen or heard of this..any ideas?? feels almost like the transmission is loose or driveshaft is loose??

check the drive shaft by trying to wobble it with your hands. If you hear clunking youll know. also check your exhaust brackets to make sure theyre all still attached. floppy exhaust is an easy fix and quite possibly what youre feeling.