I have a 2004 FX4, 5.4 auto, 136k. Getting some pop/not good noise coming from the rear side of the transfer case. I did a trans fluid service about 6 weeks ago. Transmission is like new since then. It looks like the small link of drive shaft is coming out of the transfer case. I took a picture of it but can't get the app to attach it. Any thoughts about what is going on?

 

Moved to correct section.