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Message: <blockquote data-quote="EricM" data-source="post: 2064176" data-attributes="member: 20286">How is spinning a part wearing it?   Maybe wearing the bearings at most?  Bearings are literally designed to spin.The 97-03 F150s were connected at the drivers side, which drove the diff and driveshaft.  It was disconnected at the T-case and midway on the right side axle.There were no issues on those 4WD systems at all- other than the vaccum actuaor for the axle disconnect could fail.  You could order it with a manul shifter to not have that setup- or put a manual cable in place of the vaccuum setup.  Either way, you could be 100% sure it'd always work.Ford went to the IWEs to save fuel, it had nothing to do with reliabilty of the front axle componenets.</blockquote>