1979 cevy 4X4 pickup

I have a problem with the front axle. It is making a loud clicking noise when in motion, I took the left side rotor of and it was real loose. Could
that be the problem or is it in the axles or third member?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

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.