Dropped of 904 core&rebuild kit with Jim from Jims Performance(KY),he is a tuner/engine/trans/diff builder who has helped me out in the past.I am pulling the first 904 out and when he brings the #2 rebuild back I will swap them and give him #1 to dissasemble/diagnosis/rebuild. then i will have 1 new one in the car&a new one for a spare for 2014,