2010 and 2011 had a different front diff. in 12 ford went with a torsen front diff. several (and i mean a lot) of people went top perch and had many issues with axles breaking and cv joints. depending on the amount of offroading you do, and how often you use 4x4 will affect how long it will last before something breaks. @svc @RPG @texasmotorworx and all the other companies can explain better than me
