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well based on my 10 years here on the forum and have seen every problem imaginable, i should probably give a word of advice. 2010 and 2011 trucks can sit at top perch height on the front generally with no issues. when ford introduced the torsen front diff in 2012 models, there were lots of people having problems with top perch height. the torsen didnt like the extreme angle the axleshaft was at. caused binding, grinding and breaking of various parts. usually axles or 4wd issues.