Cracking in neck when turning right but no pain, no movement limitation after whip lash type dance injury 6 months ago. will it improve with time?

Sounds positive: I think you are well on the road to recovery. You might be able to speed the process by learning the mckenzie neck exercise protocol. Most physical therapists are familiar.

Ligaments, harmless: Sound is from ligaments snapping over the bone spurs (facets, spinous processes). Completely harmless. For any numbness/weakness/tingling - see your neurosurgeon but it does not sound like anything but a soft tissue injury - which will heal up over time.