I have a question that may have been answered but i can't find a thread for it. Anyways, what TRANSGO SHIFT KIT fits the 2005 G35X AT/MT (AWD) model? Also, What's the difference between the transgo shift kit being sold on Amazon (Transmission kit 4L60E, 4L65E, 4L70E and 4L75E 93-07 Except Hybrid units. General Motors ) vesus the transgo kit 4L60E-3 Summit Racing sales? Besides the huge price difference, please help me.