Vibration at 70-80MPH - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 03-01-2013, 02:58 PM Thread Starter
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Lightbulb Vibration at 70-80MPH

2003 7.3 Crew Cab 140k miles 4x4

Got a vibration in the floorboard under accelerator and center console only at that speed, and it stops when I let of accelerator a bit and gradually gets louder from 70-80 depending on how fast I get to 80 and quiets a bit after 80. I just did brand new upper and lower moog BJS driver and passenger side, brand new tires just balanced and aligned. Factory U joints still good shape on both sides. Got underneath and found quite a bit of play in the center bearing and can shake the shaft a bit, mostly the play is in the rubber some people say there should be but this really seems like too much play, the bearing itself looks a bit cruddy and in not so good shape. U joints on the driveshaft don't look bad enough to cause this vibration and I notice no play in my driveshaft except the excessive play in the center bearing. When we did the balljoints and had everything apart it really didn't seem like the hubs were in bad shape but....I could use some opinions from experts . Thanks!
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post #2 of 11 Old 03-01-2013, 03:00 PM Thread Starter
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Any opinions left would be great but I will be leaving so I will not have a quick response. Again thanks
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post #3 of 11 Old 03-03-2013, 02:56 PM
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Vibration at 70-80MPH

Carrier bearing needs to be replaced. Only $26 for the international bearing at orielys. Changed mine out in a half hour.


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post #4 of 11 Old 04-02-2013, 04:27 PM Thread Starter
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Carrier Bearing replaced and still getting the vibration. I have no vibration or shaking in my brake pedal or accelerator pedal and I am almost positive this is a front end vibration. I don't feel it in my seat or my steering. I feel it on the floorboard driver side only and it's a howling sound as I'm accelerating and it almost sounds like the sound reverses itself when I let off the accelerator. I am thinking hub assembly but I am starting to lean towards the transmission.
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post #5 of 11 Old 04-03-2013, 11:53 AM
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Universal joints?
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post #6 of 11 Old 04-03-2013, 07:10 PM Thread Starter
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It's when the truck is in 2wheel, besides that the front u joints look alright.
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post #7 of 11 Old 04-04-2013, 04:15 AM
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I assumed it was in 2 wheel drive. It's not very often that I use 4 wheel drive unless I am stuck in the mud. I was talking about the rear universal joints. Does your rear pinion bearing feel good?
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post #8 of 11 Old 04-05-2013, 03:13 PM Thread Starter
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Gonna get that looked at tomorrow when I got the chance, thanks for the feedback. Will update
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post #9 of 11 Old 04-21-2013, 12:22 AM
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Do you have a drive shaft shop somewhat local? You may need it rebalanced.

For me I chased my tail for 2 years finding a vibration(s) and everything replaced except for the transfer case. And low and behold, that's what it is. The plant gear on the input shaft is worn out. It is much worse when it's was in 4WD. Chain had a lot of slop too.

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post #10 of 11 Old 04-21-2013, 06:49 AM Thread Starter
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Quote:
Originally Posted by hucorey View Post
Do you have a drive shaft shop somewhat local? You may need it rebalanced.

For me I chased my tail for 2 years finding a vibration(s) and everything replaced except for the transfer case. And low and behold, that's what it is. The plant gear on the input shaft is worn out. It is much worse when it's was in 4WD. Chain had a lot of slop too.

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I actually found out what the vibration was. It wasn't the hub assembly, transmission or any of the drivetrain..it was the intercooler pipe, it had heat wrap on it but it was snugged so close to the power steering that it was actually vibrating on a fitting...Unbelievable that was the last thing I thought would of caused that much sound. I shimmed a piece of folded rubber in between them then it went away.
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