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Front Vibration during low speed turning

Discussion in '3rd Gen - 2007 - 2017' started by JoJoDaClown, Apr 6, 2021.

  1. JoJoDaClown

    JoJoDaClown Member

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    2017 Expedition MAX 4x4. Recently, the truck has started to vibrate, but at the front end, during turning at low speed. Forward or Reverse. It feels very similar to the common rear LSD shutter that happens when you need to change fluid and LSD additive. It makes me think it's the front diff. I changed the fluid, which was very black and your shimmery, but no flakes. I plan to run this fluid for a month and go do some figure 8's in a parking lot to work it through, then change it again.

    What scares me is it almost seems like something may have happened that the drive axle is no longer firmly secured to ensure proper alignment between the bevel to the pinion. Like the cap cracked. From what I can tell, though, is the front diff cover can't be removed without taking out the steering rack. Anyone tried before?

    The vibration doesn't occur when at a complete stop and going knock to knock on the steering, so it doesn't appear to be rack related. No steering wheel wobble occurring either, so don't think it has anything to do with steering linkage or ball joints. Everything looks good underneath for those, too.


    Does anyone else have some theories as to what it may be?
     
  2. justinp16ex

    justinp16ex Full Access Members

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    Can be tough, I was convinced my vibration was from the front until I realized it wasn't. It was the the rear diff. Took me some messing around and listening in the driveway figure it out.
     
  3. JoJoDaClown

    JoJoDaClown Member

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    True, after your comment, I went around a bit and I guess I don't know for sure if front or rear, but it just feels like it's the front? Also, I just changed the rear last year with Amsoil Severe Gear 75w90 and the Ford CM19546A1 Friction modifier. So I'm doubting it's the rear.
     
  4. justinp16ex

    justinp16ex Full Access Members

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    How many miles?
     
  5. JoJoDaClown

    JoJoDaClown Member

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    54,000.
    Mostly no towing until last year after we bought a camper.

    This past winter I got stuck and did the back and forth love making with the snow drift until I got out, in 4L.

    About 1 month or so ago I had gone through with FORScan and cleared learned tables.

    It started happening 2 weeks ago.
     
    Last edited: Apr 6, 2021
  6. LokiWolf

    LokiWolf Full Access Members

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    Possible front Hub locked, and not disengaging.


    Sent from my iPhone using Tapatalk Pro
     
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  7. justinp16ex

    justinp16ex Full Access Members

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    Have you tried the vehicle in Auto 4 or 4Hi to see if you're vibration goes away?
     
  8. JoJoDaClown

    JoJoDaClown Member

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    Yes, I've tried, it doesn't seem any different, with exception to the grabbing and bouncing while turning on cement.
     
  9. JoJoDaClown

    JoJoDaClown Member

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    I jacked up the front end and confirmed the IWE's are properly functioning and disengaging. I like the thought, though, and a common Ford issue.
     
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  10. justinp16ex

    justinp16ex Full Access Members

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    Ya it's low mileage but I think it's your rear diff clutch packs. They aren't very durable, even though you've maintained it. Could try dumping some more friction modifier in. People have had these things fail with only 20k miles. Could be something else but you have the usual symptoms. Are you still under warranty?
     

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