4x4 hard clunk? please help
 

Hey guys happy to be part of the forums.

I have a 1995 Rodeo that is border line immortal. However i am experiencing a loud hard clunk when in 4x4 under load. it feels like its coming from the middle of the truck at about where your feet would be. has newer axle shafts on both sides so that cant be it. i know what a bad u-joint sounds like and its not that. I was thinking is it possible to be slipping in and out of 4x4? any help would be great thanks for your time!