Not sure I understand the situation...so sounds like you have/had a car on which you owed $8k at the time of separation? She's keeping the car so you need to pay off the balance and want half of the fair market value? which combined you're estimating to be $11k cash? She's willing to pay you that sum in the form of a IRA/401k balance transfer?
Me: 35|WAW: 38|D: 6yo | http://tinyurl.com/2dxx7m6 Feb 2006, left, came back in two weeks Aug 2006, left again Apr 2007, filed for divorce Dec 2007, reunited Mar 2010, moved out, filed again
