How can you tell if they are worn? Is there some visual way? For example, when my rear wheels are off the ground, it looks as if the dog bones are deformed or slightly twisted/changed angle. Is this correct? This a bit hard to describe. Even so, the "boots" around them do not appear broken.

I thought about replacing them as I understand they do "wear/fail" and affect handling and increase what appears to tracking/wandering issues. Parts are about $80 through BMA. Just do not want to spend $$ if not needed.

Thanks,