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Old 01-08-2004, 02:39 PM
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WICKED vibration man

Got a pain in the *** problem and thought maybe some of you might have had it as well.

I have a 66gmc 3/4TON 2wd with a 350 and a Turbo350 tranny. Rear end is a 4.11 posi.

Low speeds I have a harmonic vibration. 10-19 mph or so. Then at 20-39 or so its gone but at 39 and above it comes back and gets worse with speed (only speed not RPM). The sound and vibration both worsen equally. I thought it could be U-joints so I replaced those. Thought that the shaft was too far into the tranny but that seems okay (bout 1.5-2 inches out of the tranny). Then one day I noticed the Tranny had become unbolted from its mount and was about 2 inches to the left of where it should be! So I pulled it back over (which was quite hard) and remounted it. Since then the vibration has been worse. It is possible the driveshaft has become bent (it goes through a oval crossmember).

Also, the engine seems to sit like 1.5 inches to the right (looking at the engine) more than the other side however its always kinda been this way. The engine mounts are about 2 years old I wonder if these are bad or not mounted properly or what.

If you all have ANY ideas I would greatly appreciate them.

Thanks.

Dylan

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Old 01-08-2004, 03:07 PM
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Do you have a steady bearing, or is the driveshaft one piece?

My brother's 1965 Chev pick-up had a steady bearing that was bad, it had symptoms more or less what you describe.
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Old 01-08-2004, 03:24 PM
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Oh sorry i should have included that in the info. Its a one piece driveshaft.
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Old 01-08-2004, 04:10 PM
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Have you checked the tires?, one may be out of round, or a bad belt.
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