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[GXO]

Look under your truck from the front corner. You will see a diff support on both sides of the front diff.

If it is cracked, it is obvious.

Example of mine

 

[tree hugger]

Hey i would also check that the mounting surface where spacers attach to the hub is hit with a wire wheel to make a flush mount. I don't think it's your spacers if the mounting surface is clean.

 

[Placemotorsports]

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[TRY666R]

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[co4wheel]

How is the vibration

 

[Placemotorsports]

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[TRY666R]

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[Placemotorsports]

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[TRY666R]

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