Rumbling noise on turning 2017 exp LTD EL

Discussion in '3rd Gen - 2007 - 2017' started by Cynthia2963, May 17, 2019.

  1. LokiWolf

    LokiWolf Full Access Members

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    Yes, for Limited Slip.

    There is nothing physical inside the Center Diff deciding percentages of Torque to distribute, and so forth.

    Engaged, means 50% Forward.


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  2. 16plati

    16plati Full Access Members

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    Found out what’s likely causing my rumbling. So with the steering wheel centered I’m dead in for alignment. However with the larger tires and the spacers when I start turning at low speeds (below 15) the tires are actually being pushed due to the changed suspension geometry most likely caused by the Readylift 3/2 kit. Not sure if there is a fix for this as alignment is measured for when the wheels are pointed straight. Any thoughts? Are there maybe Different alignment specs for lifted vehicles?
     
  3. LokiWolf

    LokiWolf Full Access Members

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    No, The 3/2 is already pushing the geometry of the A-Arms. It is because of the Independent Suspension.

    A relocation bracket or longer A-Arms would be the solution, but nobody is going to build a long travel kit for these trucks.


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  4. creef14

    creef14 Full Access Members

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    When I lifted my 06 I had to play around with a bunch of F150 aftermarket parts but I eventually found a combination of parts that worked to hold alignment and a mostly-normal ride. It was a real PITA, and was straight up trial and error; installing parts road testing, removing, and trying again. It helped that I had a friend who was a shop manager at the time so I got to use his lifts, tools, and alignment scanner after hours.

    It's why I am hesitant to lift the 17 now. But I'm rooting for you to find a solution so I can copy you:grd:
     
  5. 16plati

    16plati Full Access Members

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    I’m going to take my spacers off and see if that helps. Will also be looking at brakes like someone had suggested
     
  6. 16plati

    16plati Full Access Members

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    Just weird that it has just started since this past winter. Lift and tires been on for about 2 years. Spacers since about december
     
  7. MrSticker

    MrSticker Full Access Members

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    I'm wondering if you read or viewed any of these references that explain how it works?

    https://en.wikipedia.org/wiki/Ford_Expedition#Four-wheel_drive_system

    https://en.wikipedia.org/wiki/ControlTrac#The_Modes



    https://www.designnews.com/automotive-0/4-wheel-drive-steps-back-future/143802243139748



    https://patents.google.com/patent/US5485894A/en?oq=5485894



     
  8. LokiWolf

    LokiWolf Full Access Members

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    Nope, Based it off experience on my previous Fords and the way this one acted.

    One of those videos talks about PTU’s, which ours is not.

    I am one who will admit when I am wrong. It appears we do have a Torque on demand Center Transfer case. It is a Borg Warner 4417. I am going to have to go do a bit more reading. I was wrong. If you have the 4A option there is a hydraulic clutch capable of delivering Torque on demand. I am impressed.

    Thanks for posting...got some studying to do!


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  9. 16plati

    16plati Full Access Members

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    Confirmed my noise is from the tires being so wide with the spacers. When I turn at low speeds the tires are being pushed forward as they can’t turn fast enough due to angle of suspension and ackermann effect. Something I’ll just have to live with
     
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  10. Black

    Black Full Access Members

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    ReadyLift suggests different alignment specs.
    They are listed on the last page of the instructions.
    https://www.readylift.com/media/installation-pdfs/69-2070.pdf

    Whether that will remedy your issue I can’t say.
     

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