2001 supercrew 4x4. need to replace lower ball joints and figured I might as well do the uppers while at it. Have found conflicting info on wether the lower joints are replaceable or not. One source says they are but Chiltons says you need to replace the entire arm just like the top joints. The bottoms sure look like they can be removed to me. Can someone set me straight on this?

 

They are replaceable separate..