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Message: <blockquote data-quote="teejay" data-source="post: 192939" data-attributes="member: 51">have you had the sensors checked? gearshifts are actuated by pressure and a hydraulic unit, if any of these in the chain fails/fails to function at optimum levels, you will get these symptoms worst part is tracing down each and every component as its not easy to diagnose off hand, this diagnosis usually time consuming , or else you may end up changing unneccessary parts hums if constant are caused by bearings, can easily be diagnose by a competant mechanic, if it goes on and off, usually its the center bearings or rear differential parts, quick fix if its the rear diff would be a thicker diff oil</blockquote>