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Tire Wear/Road Crowns

Discussion in 'Ford Raptor Problems and Questions Forum' started by MFNG, Sep 3, 2020.

  1. MFNG

    MFNG Full Access Member

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    I’ve been battling what I though was an alignment issue, but appears to be a tire wear issue.

    My 2014 Gen1 seems to want to pull to the right slightly after an alignment. I figured it was because it had a front right wreck before I got it, but the frame was checked and ok’d before purchase.

    Next I thought maybe the cams were slipping. The last alignment came back as within spec, but the truck now fades hard right 2k miles after last alignment.

    After swapping the two front tires the truck stays mostly straight, with a slight preference to the right.

    My question to you is: Do you think since the stance is wider that it is causing abnormal wear on tires due to them not riding in grooves created by most passenger vehicles? Has anyone else experienced this themselves with these or other trucks with a wider than normal stance?

    Caveat: I live in IL and our roads, like the rest of our state, are complete garbage.
     
  2. FordTechOne

    FordTechOne FRF Addict

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    Was the frame inspected on a frame alignment machine?

    If you have your alignment specs, check the Steering Axis Inclination (SAI) reading. If SAI is out of spec or there is a variance of more than a couple tenths of a degree between sides, the frame or a suspension component is bent.
     
  3. MFNG

    MFNG Full Access Member

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    Thanks, I will have to look at the paperwork from the last alignment and let you know about the SAI.

    The frame was not put on an alignment machine that I am aware of, but it was lifted and thoroughly inspected by my local race shop. No other signs of hard use were observed at the time of inspection either.
     
  4. MFNG

    MFNG Full Access Member

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    Looks like SAI is .2 between the two. What is normal? Is 14 a high or low number?

    A1571382-D181-49F6-BCDA-9902E119A872.jpeg
     
  5. FordTechOne

    FordTechOne FRF Addict

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    There is no spec for SAI, but a cross SAI of 0.2 degrees is not a concern.

    Do your tires have abnormal wear patterns? If the truck was driven out of alignment for a while, the tires may be the cause of the pull, especially since you noted that the pull changed when you rotated tires.
     
  6. MFNG

    MFNG Full Access Member

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    There is no noticeable abnormal wear pattern that I can see personally. I don’t have a lift so it’s difficult to say for sure when it’s grounded.

    The alignment was done a few months ago and when inspected the other day was still in, but the pull to right was still increasing regardless.

    Still searching for the cause of the right pull...for now I’m assuming riding outside of the set road grooves is causing the abnormal wear?
     
  7. MFNG

    MFNG Full Access Member

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    @FordTechOne Found the problem, if you could call it that.

    Left side had a HD cam kit from SPC installed but the right didn’t.

    It was used when I got it and I am assuming that the minor front right wreck on the car fax indicates that the lower arm was replaced or removed and the kit never made it back on.

    I would hope that someone wouldn’t only put it on one side, but stranger things...
     
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  8. FordTechOne

    FordTechOne FRF Addict

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    Glad you got it resolved!
     
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