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heres the problem. while the truck is coasting there is a horrible vibration and loud hum coming from the rear end. the weird thing is any throttle at all makes it stop even the wait of my foot on the throttle. i have gotten out a few times and put my hand on the differential and its pretty hot. any ideas?

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check your oil level if its full look at the pinion bering its developed some back lash some how pinion bering i think is the rascel.

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Actually, check the center carrier bearing also, i had mine fail and it did the same things you described. I even did a write up on how to replace it. Still good to check out the rear diff as well. http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/28-transmission-systems/244-driveshaft-center-carrier-bearing

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Thanks for all the replies guys. Was wanting to get into this weekend but I work about an hour from home and leaving work it's started popping and clicking real bad. Knew I couldn't make it home so I had to leave it at shop. Guy said it's more than likely pinion bearing

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Sounds like the same thing I had when I first got my truck. I lost a tooth on the pinion gear, made plenty of metal and lots of noise similar to what you described. GB

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