Rear drive shaft slip joint (click, click, click)

[1986ford]

Hello, I have a 2003 Explorer XLT AWD. Currently the rear drive shaft has a continuous click,click,click. Its coming from the area just ahead of the slip joint. If anyone has a suggestions or pictures of a tore down drive shaft please help. I have replaced all wheel bearings in the last year. All U-joints are solid and in good shape. Any help would be greatly appreciated.

Thanks

 

[1986ford]

Problem fixed

Well I got sick of the noise (click,click,click). Pulled out drive shaft, pulled slip joint apart no problems, regreased put back together. Checked front U joint (ok). But the rear U joint had one bearing cap that had rust dust on it. Replaced with new U joint. All better now. $35.00 fix.