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98 expy with a vibration

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Old Feb 12, 2008 | 01:20 PM
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paredneck33
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98 expy with a vibration

I have a 98 expy. that about a month ago developed a mild vibration at aruond 45-50 mph. So I did smoe checking underneath and found a mildly worn ujoint on the front driveshaft. Then a couple days go by and my wife noticed that the 4wd wasn't working. i did a simple check of the system and found that what I think is the problem. The v.c. motor on the front diff. doesn't seem to be worikng. What I was wonder is could this also cause the vibration since the truck is in 2 wheel drive. Or do I have another underlying issue. Also could running the truck with a bad v.c. motor cause internal damage to the diff.
 
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