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Old 12-10-2012, 02:31 PM
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Location: Texas
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Default Re: 3rd transfer case seal in a year!

The clunk is normal for GM trucks. A longer prop is not good idea as it has to move in/out due to suspension travel in rear. The prop is causing early seal failure because small rocks and dirt get trapped in there and wear grooves in prop shaft. Simply replace prop with new OEM shaft and seal and problem will be resolved.
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