load vibration from the rear when coasting

Greg5OH

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Recently developed this nasty booming noise and vibration from the rear of the truck. Basicaly anytime the weight of the truck is pushing it forward, can be in gear, neutral, cluth in, out. As long as you are completel yoff the throttle, it will make this noise between 45-60 mph.
Havent had a chance to check anythign yet. Has new u joints throughout, only the carrier bearing is old, but was fine when i checked 15k ago.
 
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