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Yep... Just talked to corey... They changed the pinion bearings in the rear.. His suggestion was getting a donor 2010 axle casing and using all the 2012 components (axles, spider gears, eld) and use 2010 ring, pinion and bearings.. Problem solved..
-Greg (aka squatting dog)
Got my guy looking into stuff for the rear for you guys! We were talking last night when I was picking up my truck about the rear ends of the 2011+ models and how they changed the sizes. He knows about it and is going to get back with me. There was talk about an adapter bearing which is sized inside and outside based on what its going into. Anyways hoping to help you 2011+ guys out because I can tell you right now these freaking gears rock!