opinions on vibration issue - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 01-21-2011, 03:48 PM Thread Starter
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Question opinions on vibration issue

Starting about a month ago I get a vibration in the floor board and hear a whining and slight grinding noise when above 60mph but only when I let off the throttle and only for a few seconds each time. I can hear and feel it the most when I let off most of the way but keep a little pressure on the pedal putting the driveline in a neutral position, this makes it last longer. I cant feel it in the steering wheel. It seems to get worse the faster I go past 60. I pulled the drive line and replaced the one U-joint that was bad, but that was not it. Carrier bearing feels good. Sounds like its coming from up front somewhere but not sure. Could this be wheel bearings? Any thoughts or suggestions would be appreciated.

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post #2 of 14 Old 01-21-2011, 05:14 PM
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Check where your downpipe makes the turn from coming down to going towards the back of the truck. It should go over a crossmember right after the turn, and if your downpipe joint has drifted a bit and is close to the crossmember, it can touch it and make the noise you described in various circumstances. Mine did it only at idle, but not above.

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post #3 of 14 Old 01-21-2011, 08:10 PM
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I would double check carrier (steady) bearing and u-joints again, had the same issue changed rear u-joint and steady bearing.



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post #4 of 14 Old 01-22-2011, 05:34 AM
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subscribing --- i have a high speed vibration also

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post #5 of 14 Old 01-22-2011, 08:35 AM
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Do you guys have CV joints on your rear shafts? If so have you checked them. Just had mine re built but it was vibrating and loud.

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post #6 of 14 Old 01-22-2011, 01:01 PM Thread Starter
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I think I'll replace the other two u-joints and see if that helps. After replacing the one that was leaking a little it seems to have gotten slightly better.

04 F250 6.0 CCSB Lariat
ARPs, Insight CS, SCT gearhead & Quicktricks, RCD EGR Delete, MBRP 4" straight, Airaid Intake, upgraded banjo bolts, Blue spring, Harpooned tank, Dfuser Coolant filter, CCV filter, High Idle, ELC, 8" lift & 38's, Custom Ladder bars, RedHead steering gear, DDM HIDs heads & fogs, 20% tint, 08 console, 08 rear bumper, 08 Mirrors, 08 trans pan & filter & GOGO Solonoid


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post #7 of 14 Old 01-24-2011, 06:38 AM
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Quote:
Originally Posted by ab2625 View Post
I think I'll replace the other two u-joints and see if that helps. After replacing the one that was leaking a little it seems to have gotten slightly better.
There are no cv joints in superduty, my front drive shaft has a double cardion joint

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post #8 of 14 Old 12-02-2011, 12:54 PM
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what was the verdict?

2005 F-350 King Ranch, FX4
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post #9 of 14 Old 12-02-2011, 01:13 PM Thread Starter
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I had a single piece rear drive shaft made and the vibration is almost gone. When they built it they didn't have the end plates to ballance, so I need to get it all rebalanced and I'm confident that it will be all good.

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ARPs, Insight CS, SCT gearhead & Quicktricks, RCD EGR Delete, MBRP 4" straight, Airaid Intake, upgraded banjo bolts, Blue spring, Harpooned tank, Dfuser Coolant filter, CCV filter, High Idle, ELC, 8" lift & 38's, Custom Ladder bars, RedHead steering gear, DDM HIDs heads & fogs, 20% tint, 08 console, 08 rear bumper, 08 Mirrors, 08 trans pan & filter & GOGO Solonoid


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post #10 of 14 Old 12-02-2011, 04:24 PM
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i will be driving down the highway, everything is great, go to let off the throttle and a violent noise sounds like something spinning in a worn bearing race under my feet for a couple seconds or until i give it more throttle. I sware this truck is biggest pile of ****

2005 F-350 King Ranch, FX4
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