Lately on my 2002 wj with select trac, while driving or while shifting I will begin to hear a noise similar to if you stuck a stick in a bicycles spokes and rode it around. It will usually go away once it shifts again but ever so often it will happen again. It probably happened around 10 times in the past month. The other day It was doing it repeatly and wouldnt go away so I put the shifter In nuetral and moved the selec trac shifter up and down and back into 2wd and it went away. What could this be?? My transmission was just rebuilt also

 

Bump bump

 

Shift linkage need adjusting??