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Message: <blockquote data-quote="AZ-Rich" data-source="post: 2015506" data-attributes="member: 11519"><p>I have a 2010 6.2 and recently had low speed rotational noises developing that were not present before I replaced all my shocks after having them rebuilt.  Finally dialed in on the diagnosis that my IWE vacum lines were not holding vacum and the half shafts engaged were causing the noise.  After 14 years those IWE rigid vacum lines were as brittle as can be.  I must have broke one or more when pushing them away from the front shock tower mounting bolts.  I could hardly believe just how brittle the entire lines were!  After a lot of research and discussions with the main Ford Parts Director (my neighbor) in my area I learned Ford stopped making the AL3Z-7A785-E OEM vacum line assembly for the 2010, so it’s now obsolete. He did suggest the service techs have used a later model tube assembly BL3Z-7A785-A instead.  Essentially this one is pre-bent the same as the original but some of the zip clips are either the wrong shape or on the wrong location to fit right.  With some simple modifications (replacing about 6 zip clips and having those in the right spots) the new lines did fix the problem.  With the front wheels jacked off the ground; It’s easy to pull the rubber lines from the hub actuators and using a hand vacuum pump down each of the actuators to test the vacum and see if your front wheels will spin freely. Those actuators should disengage the hub with at about 10 in of Hg.   As a reference your IWE system should be pulling ~18-24 in Hg with the engine running in 2 wheel drive depending on elevation.  Continuing to Run those actuators partially engaged (with that rattle sound) will insure you’ll have to replace them.  Might be time to check your lines for old brittle tubing.</p></blockquote><p></p>

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