Jimmy grinding noise

My '98 jimmy slt (4wd) makes a grinding noise while driving. I fixed minor problems at the wheels and confirm the spin fine - nothing unusual. I've dropped both driveshafts and confirmed the U-joints are free & smooth.
Now what? With 100,000km could this be just normal GM quality aka wear?
-Mike-
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.