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Old 08-14-2015, 10:19 PM   #1
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Default Strand intermittent vibration

I have a 02 suburban. After driving for about an hour, there is a vibration that is not related to engine speed, but is related to wheel speed. It'* pronounced at high way speed. It'* similar to a rumble strip. It'* not a bearing, as it'* the same turning either way. Rotated tires, no change. I'm thinking u joint, front diff, or transfer case. Just had the trans pan off, pretty clean. Thoughts? Thanks!
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Old 08-15-2015, 04:13 AM   #2
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Rumble strips........u joints.
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Old 08-15-2015, 09:01 AM   #3
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Default Roger that

Thanks for the very late reply. I shall give it a go!!
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Old 08-15-2015, 06:11 PM   #4
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Default Update....

So the front prop shaft is turning in 2wd, but I am trying to determine if the front diff is engaged. Maybe a bad switch? No idea when the trans case was serviced. 119k miles.
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Old 08-16-2015, 12:24 PM   #5
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Default Front Diff

The front diff appears to be disengaged in 2WD and responds to the switch commands. I am wondering if the transfer case has an electrical issue, plus the u joints.
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Old 08-16-2015, 06:00 PM   #6
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Even with the front diff disengaged......driving around in 2x4.....the front axles are still spinning. Here'* a link to something you might find of interest: Front Differential Noise - 1999-2006 & 2007-2013 Chevrolet Silverado & GMC Sierra 1500 - GM-Trucks.com
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Old 08-16-2015, 06:10 PM   #7
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Quote:
Originally Posted by 1.8TTony View Post
Even with the front diff disengaged......driving around in 2x4.....the front axles are still spinning. Here'* a link to something you might find of interest: Front Differential Noise - 1999-2006 & 2007-2013 Chevrolet Silverado & GMC Sierra 1500 - GM-Trucks.com
....specifically the info relating to the axle carrier bearings inside the front diff.
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Old 08-17-2015, 11:29 AM   #8
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Default Leak

It looks like there is a leak on the drivers side output shaft. Maybe the bearing is shot. Looks like I need to get it down and opened up. Might takes be a while.... Thanks
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