I have a 2006 Altima 2.5S with the RE4F04B valve body in the 4 speed automatic transmission. Where can I buy a rebuild kit for the valve body? I am not looking for a shift kit. I just want to rebuild it and get all the foreign material out of it without having to modify anything. I have searched all over the web and have not found anything other than a shift kit. I have checked the resistance of all of the solenoids, and all are within spec. I have not pulled the pickup off of it yet. I have heard that there is no filter on this transmission but have not checked it out yet. If there is no filter, is there an aftermarket one available to help keep junk out of the valve body? Thanks.