Had old whiplash from an accident when a junior in high school. now neck is very cracky even with out doing anything to cause it. no pain is involved?

There's cracks: and cracks. I can demonstrate if you were on the video service. Small joint pops are not serious and represent bubbles forming and popping due to pressure changes in the joint. There is a rough sound from a thickened tendon rubbing over a surface... not generally very meaningful. The more serious (low pitched, irregular and rough) sound of bone grinding on bone is usually with pain ...