Found my "thud" causing issue.... - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 08-23-2012, 04:57 AM Thread Starter
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Found my "thud" causing issue....

Last night I found a thread on this site that got me looking for other possible issues with my front end.

I found that my front HUBS/bearings might be bad. The reason; I can move either of my front axle shaft up and down with my hand right at the U-joint. The U-joints are fine, there is zero play in the U-joint. However, there is at least a 3/8" movement in play from full up to full down in the axle shafts.

The play seems to be in the outer axle stub shaft that goes into the hub bearing. And it's the cause of the "thuds" while going over bumps.

Is that normal? I'm thinking NO.....

“Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.”
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2006 F250-Sinister coolant filter, Amsoil bypass oil filter, CTS Edge, 5" MBRP exhaust (off road), blue spring....
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post #2 of 10 Old 08-23-2012, 03:50 PM Thread Starter
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Can anybody verify there axle shafts going into the hub/bearing assembly have or do not have an UP and DOWN movement.

Try pushing the u-joint assembly straight up.

let me know...

Thanks

“Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.”
― Albert Einstein

2006 F250-Sinister coolant filter, Amsoil bypass oil filter, CTS Edge, 5" MBRP exhaust (off road), blue spring....
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post #3 of 10 Old 08-24-2012, 05:47 AM
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I'm in to find out as well. I'm hoping somebody has been able to test this and get some info.

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post #4 of 10 Old 08-27-2012, 05:28 AM Thread Starter
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Quote:
Originally Posted by new2fossil View Post
Can anybody verify there axle shafts going into the hub/bearing assembly have or do not have an UP and DOWN movement.

Try pushing the u-joint assembly straight up.

let me know...

Thanks
anybody

“Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.”
― Albert Einstein

2006 F250-Sinister coolant filter, Amsoil bypass oil filter, CTS Edge, 5" MBRP exhaust (off road), blue spring....
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post #5 of 10 Old 08-27-2012, 08:55 AM
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best way to check for bad hub assemblies is to jack up the front of the truck, throw some jack stands under it and then grab the top and bottom of the outter edge of the tires and push the top in and pull the bottom out kind of shaking it by going back and forth.

Bryan At Alligator
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post #6 of 10 Old 08-27-2012, 09:01 AM Thread Starter
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Quote:
Originally Posted by Ford7three View Post
best way to check for bad hub assemblies is to jack up the front of the truck, throw some jack stands under it and then grab the top and bottom of the outter edge of the tires and push the top in and pull the bottom out kind of shaking it by going back and forth.

I did. There is no play. My main concern is the outer axle shaft going into the hub. There seems to be more play than normal. But I don't know what normal is.

“Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.”
― Albert Einstein

2006 F250-Sinister coolant filter, Amsoil bypass oil filter, CTS Edge, 5" MBRP exhaust (off road), blue spring....

Last edited by new2fossil; 08-27-2012 at 11:49 AM. Reason: mispelling
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post #7 of 10 Old 09-28-2012, 07:57 PM
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Quote:
Originally Posted by new2fossil View Post
I did. There is no play. My main concern is the outer axle shaft going into the hub. There seems to be more play than normal. But I don't know what normal is.
The play in the axle is normal. there is nothing to tighten it up with, its only held in there with a snap ring. The thud that you are hearing does it sound like its by you feet when going over bumps? What year is your truck?
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post #8 of 10 Old 07-09-2014, 02:40 AM
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i have same problem with my 03. i believe it is the outer axle shaft bearing for the axle shaft. but not sure. i have same amount of play but it is more toward the axle tube housing. anyone elses problem sound like this?
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post #9 of 10 Old 07-09-2014, 07:18 AM Thread Starter
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Quote:
Originally Posted by new2fossil View Post
Last night I found a thread on this site that got me looking for other possible issues with my front end.

I found that my front HUBS/bearings might be bad. The reason; I can move either of my front axle shaft up and down with my hand right at the U-joint. The U-joints are fine, there is zero play in the U-joint. However, there is at least a 3/8" movement in play from full up to full down in the axle shafts.

The play seems to be in the outer axle stub shaft that goes into the hub bearing. And it's the cause of the "thuds" while going over bumps.

Is that normal? I'm thinking NO.....
I had a very similar sound in my 06' and found my front axle shaft also move up and down very easily. After I pumped them full of grease...problem (thud) went away. I was still able to move the shafts up and down, but they were a little tighter from the grease.

“Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.”
― Albert Einstein

2006 F250-Sinister coolant filter, Amsoil bypass oil filter, CTS Edge, 5" MBRP exhaust (off road), blue spring....
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post #10 of 10 Old 07-09-2014, 07:29 AM
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have you checked the end links?
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