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Old 11-06-2013, 11:28 AM
rich6111 rich6111 is offline
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Vibration seems to stop when I let off of gas. Can feel in steering wheel setting still. Replaced all joints and carrier bearing????
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Old 11-06-2013, 11:58 AM
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You need to check your Harmonic Balancer at the front of the engine. If this is out of sync, there will be vibrations felt elsewhere.
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Old 11-06-2013, 01:01 PM
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Balancer is good and has not slipped.
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Old 11-06-2013, 01:36 PM
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First of all, what year truck are we talking about? Some 12v engines have more vibration than the 24v engines do. Have you done anything to the engine lately such as adjust the valves or injector work? Is this an auto or manual transmission? Any noises that correspond with the vibration? Let us know.
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Old 11-06-2013, 02:26 PM
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It is a 2003 dually 3500. 24v auto. done nothing to motor. 60'000 mi. No noises. Changed all u joints all wheel joints. I have not checked the flywheel yet. No plowing or 4 wheeling. No towing. It stops when I let off the gas. It is almost like a humming that goes up and down. It does not shake like a tire out of balance. I can feel it in the steering wheel with it setting still. Is it possible it could be the exhaust without making noise?
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Old 11-06-2013, 02:30 PM
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Hm. I guess if it was me, I would check the converter bolts next. Usually though there is some noise associated with them being loose.

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Old 11-06-2013, 03:58 PM
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Converter bolts are all tight. Can't see much but I did not see any cracks. End play felt right. Any suggestions?
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Old 11-06-2013, 04:07 PM
rich6111 rich6111 is offline
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There is a little play in the rear trans bushing but it seems normal to other cars I have.
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Old 11-06-2013, 07:42 PM
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You feel it only when pulling? Since you shot down all the rest of my ideas I will throw another at you. When you start the truck cold, pop the hood and feel each exhaust runner right off the head for a temperature difference. It sounds like you may have an injector screwing up on you. You can also use an infrared thermometer to be more accurate. There may be one that is plugging and the runner will be colder than the others OR it may be one is dripping or giving a slight amount more fuel than the other and that runner may be warmer.
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Old 11-06-2013, 07:52 PM
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You also need to check for codes, if there are any, and post them up.

Your driveshaft may not be clocked right, since you changed the u-joints.

Now, since you can feel the vibrations while sitting still through the steering wheel, this points to the engine/transmission. Could be a loose converter, loose trans mounting bolts, or loose/broken starter ring/flexplate.

You feel the vibrations under acceleration and while going the speed limit. The vibrations quit when you let off the go pedal. You feel the vibrations through the steering wheel. Correct?
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Toys:
'79 CJ5, 258ci, 3" lift, 33x12.50x15, Stock Engine and 3 Speed Tranny
'05 Suzuki, GSX1300R, Hayabusa, All Stock, #3('00 blown engine, '00 stolen, & '05)
The complete live & learn and pass it on by H. Jackson Brown, Jr.
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