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Old 11-19-2015, 11:16 AM   #1
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Question Severe Vibration

I have a 2006 Forest River Lexington 255 GTS on a Ford E450 chassis. We purchased it used 2yrs ago from a private owner with only 20,000 miles. It had a slight vibration which got worse over 60 mph. All tires were replaced and road balanced. We drove the home some and the vibration got worse starting about 40mph. We took it to a local truck repair shop that does driveline work. They have replaced the transmission tailhousing with a bearing in it, had the drive shaft rebuilt including new u-joints and retubing the front driveshaft. The vibration now is worse than ever..so bad that it's not driveable over about 30mph. Can anyone help please.
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Old 11-19-2015, 12:28 PM   #2
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I know it's probably hard to describe, but what does the vibration feel like?
Is there any sound associated with it?

Have the motor mounts been inspected?
Has the harmonic balancer been checked?
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Old 11-19-2015, 12:29 PM   #3
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Severe Vibration

Feel it in your seat, or in the steering wheel?

I don't know what your unit is....

But " front driveshaft"?


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Old 11-19-2015, 12:30 PM   #4
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Carrier bearing for the drive shaft.
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Old 11-19-2015, 12:41 PM   #5
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Possible that the rear end has moved and changed the pinion angle.
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Old 11-19-2015, 12:56 PM   #6
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Quote:
Originally Posted by Kevin & Judy View Post
Possible that the rear end has moved and changed the pinion angle.

That would be difficult.
The springs have a pin, that locates it to the perch.


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Old 11-19-2015, 12:59 PM   #7
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You feel it in the seat and floor.. Up on jack stands at the garage the owner/mechanic says you can still see the drive shaft quivering. Will be checking with mechanics about carrier bearing and angles. Since they do driveline work and said they replaced u-joints, front driveshaft was retubed, I would think/hope carrier bearing was checked.
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Old 11-19-2015, 01:03 PM   #8
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Same goes for motor mounts. I would think these things would have been checked.I will ask these questions tomorrow when I am there.
What is the harmonic balancer???
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Old 11-19-2015, 01:06 PM   #9
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harmonic balancer is at front of engine on the end of the crankshaft.
All pullys and belts run on it.

If it is the harmonic balancer it should vibrate by revving the engine.
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Old 11-19-2015, 01:07 PM   #10
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Usually seat vibe is coming from the driveline, rear end.

I'm with turbs, carrier bearing on the two piece rear shaft.

Explain the " front driveshaft "
As your rig is rear wheel drive.


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