I was rotating my tires today and I noticed a small knocking sound if I gripped the top and bottom of the tire and pushed and pulled.  (same sound on both sides)  There seams to be a small amount of movment at the upper ball joint.  Could someone point me to a site where someone has written up the procedure for replacing these parts.  Also what else should I look for while I have this apart, bushings, lower ball joint etc.
Thanks    
George 
'85 westfalia