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Bent if your Dodge has a Chrysler 9 inch rear it is the pinion bearing. they are too small for th unit and fail. I lost Peggy's a couple of years ago and was pissed at Chrysler. I set my pinion depth to the Nth degree and my backlash is a perfect .004 and it is exactly as it is supposed to be and now I have a gear whine. It was set wrong at the factory and now since it has been changed it is running in a different place on the gears. I used Hypoid gear oil and that seemed to have helped it shut up. The only thing that really makes the noise go away is 1,100 watts of blues or death metal.
My Ramcharger did the same thing but that one had LOUD pipes and I have no idea if it made noise after the repair
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Electrical problems on a pick-up will do that to a guy- 1990C4S
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