I have a 2006 Infiniti that Ive only had for a year with roughly 93K miles on it. I am looking have the transmission rebuilt or to sale the car for $11K. The infiniti dealer is telling to replace the valve body for $2800. Can anyone point me in the right direction.

Just pick up a used transmission on ebay for a couple hundred dollars.

Just sell it man, don't bother with the time or money to fix it. As long as you don't have any warning lights on then sell it for the Kelly blue book private party price for "fair" or "good" -whichever applies to your car.