Property division is final as of the date of divorce. However, if you have received new information suggesting that the ex lied/misrepresnted to the court during the divorce process concerning her assets which could/shoud have been considered by the Court, you may have a claim to vacate the divorce judgment. This would depend in large part on what information you have obtained and when you obtained it. Otherwise, you are stuck with the judgment that was issued.
My answer does not make me your attorney or create a former-client/current-client relationship with you. I encourage you to speak with an attorney before acting upon any of the statements I make. If you would like to speak with me further about your issue, please schedule a free initial consultation (in person or over the phone) by calling my office at (920) 459-8490, or by emailing me at firstname.lastname@example.org. You can also visit www.klpplaw.com for more information.