Can I change the grounds for divorce if my legal separation already says irreconcilable differences?

I don't know what state you are in so don't know what the potential grounds could be. You don't give a lot of information as to incomes, but it sounds as if you would certainly be eligible for alimony.

Grounds for divorce in Florida is ?Reconcilable Differences'. There may be the possibility of alimony with a marriage of 6 years, however, the amount will be minimum and the time period will be short. Alimony is negotiable, so perhaps you should consider Mediation. Mediation is Fast, Effective and Affordable, however, both spouses must agree to mediation first. Good luck.

You simply have to file an amended Petition seeking a divorce rather than a legal separation. Talk to a paralegal who does family law for guidance through this process.