Vibration at speed... - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 12-06-2011, 01:21 AM Thread Starter
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Vibration at speed...

I've tried to locate this sound and vibration I always have when at speed. I'm hearing a slight droning and definitely getting some vibration coming from what feels like the rear end.

I've rotated tires (almost new) and even had the driveshaft completely rebuild/rebalanced and the symptoms remain.

I'm beginning to think that it's either my axle. The droning and vibration occur at 60+ mph and doesn't go away whether I'm on or off the throttle.

Has anyone had a symptom like this?

My truck is an '05 with 153k on it - I plan on changing the diff fluid after Christmas but doubt my problem could be fixed with something that easy. It feels like it could be a bearing in the axle itself. Possibly even the pinion bearing - The truck does make a clunk when shifting from 2-3 - sounds like the pinion is moving too much.

Are the bearings in the SRW axle replaceable easily or am I better off taking it to a shop? I'm very capable with doing most any mechanic job, but I can't afford to have the truck off the road for more than a weekend.

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-Brian

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post #2 of 4 Old 12-07-2011, 04:41 PM
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Check your u-joints, maybe the driveshaft needs to be balanced as well.


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post #3 of 4 Old 12-08-2011, 02:11 AM Thread Starter
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Quote:
Originally Posted by superBADduty View Post
Check your u-joints, maybe the driveshaft needs to be balanced as well.


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I did, as part of my rebuild on the driveshaft - The ujoints were replaced with the oem spec Spicers. I also had the donut-looking damper section completely removed and replaced with a new tube. You could see the rubber that held it in place beginning to crack. The driveshaft guy was the one who suggested it - He said he's seen them fail a few times on these trucks and recommended getting rid of it and rebalancing.

The problem is exactly the same now as it was before the shaft was rebuilt, so I can rule it out.

-Brian

2005 F350 6.0 CC/SB Lariat 4x4
EGR Delete
ARP Studs
All updated Ford internals
Edge Insight CTS2
Swamp's 58V FICM
SCT X3
TGC 2.5" Level Kit
Zerex EC-1 ELC
08+ Step Tailgate
08+ All Power Mirrors (Factory Functions, too)
2011 Rear Bumper
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post #4 of 4 Old 12-08-2011, 05:44 AM
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Do you have any kind of lift kit installed? To me it sounds like alignment problem between the transmission flange and the pinion flange.

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