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Q: I have a popping noise some where in the rear end. It mite be the rear end pinon on 2005 Cadillac Escalade EXT

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It only makes this noise when driving not in park. this is a sporadic type of noise and some times this will be 3 to 4 times in a row.
(1) Answer
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It could be something simple like a U joint. Even if the joint is not loose, a lack of lubrication inside the joint can cause some nasty noises. The U joint is usually a sealed part from the factory and cannot be lubed. Removal of the driveshaft and inspection of the U joint can usually determine if the joint is bad.