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Old 10-25-2010, 03:49 PM
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Ford Mech's watch this vid!

So I thought the vibration on my truck was a wheel bearing (since it got louder with speed/etc). Tore it apart over the weekend to find the hub and bearings are fine. What do you Ford Mechanics think about the play in this?


I have a feeling it is going to cost more then what I had intended. I don't think there should be that much play in it. Good thing I have a second vehicle so I can save the money to get it looked at.
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Old 10-25-2010, 04:06 PM
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How much play is in that u-joint? The unit bearing\hub adjusts for a lot of that play.
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Old 10-25-2010, 05:20 PM
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Dirk, are you thinking that is normal?
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Old 10-25-2010, 05:24 PM
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Fairly normal. But I see some play in the shaft joint and I can't tell if it's the video or the u-joint.

Generally, A bad vibration that changes with speed can be the propeller shaft needing to be rebuilt.
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Old 10-25-2010, 05:25 PM
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I can tell that the knuckle seal and outer dust seals are toast. I think that Ford calls them an oil seal. F81Z-3254-CB
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Old 10-25-2010, 05:30 PM
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Yeah the dust seals on both sides of the truck are trash. I did some research on here and found out that this is pretty common.

What is the propeller shaft?
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Old 10-25-2010, 05:34 PM
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Front drive shaft.

The front oil seal (in the knuckle, the part number I listed above, takes up a lot of play like the unit bearing.
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Old 10-25-2010, 05:56 PM
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Mines just as bad with brand new wheel bearing in it so what's the fix and how hard.
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Old 10-25-2010, 06:04 PM
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First thing to do is check the "Cardan joint bearing" in the propeller shaft (front drive shaft).

Check the Front shaft U-joints.

Check the Oil Seal (knuckle seal).

Check wheel alignment and balance and wear pattern. If wear pattern is cupping, shocks are bad or alignment is off.
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