I have a 2012 Nissan Altima Coupe 2.5S. My car had a full engine block swap. New engine/transmission installed is that of a 2010 altima coupe 2.5s. Car runs great all works fine, except the transmission is very sluggish. Mechanic said it seems to be the "transmission wire harness, the harness that connects from the transmission to they transmission module, I need a 2010 transmission wire harness". I do not find this part anywhere. Can anyone help me here please. I am at a total loss with this.